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This has been posted quite a few times and I never get it :( I always say one person.  Argh. 
The first two answers doesn't answer the question of if everybody wants beer. The third logician was wrong :p
Adi Peshkess
asked if "everyone" wanted a beer. Therefore, if anyone did NOT want a beer, the answer would be no. The first person said "I don't know" meaning their (can't tell if it's a boy or girl) answer is "yes" but they don't know if there are any other no's. Same for second person. Third person determine's that both their friends' answers are yes, and since their own is yes too they then answer "yes" for "everyone."
+Cephus Jones if any of the first two would not ant a beer he/she would say "no" because then not everybody wants a beer. But because both said "I don't know" the last person "knows", that both do want a beer and because he/she wants wan, too, he/she can answer "yes".
+hassan habbak The answer is right. If the first person didn't want a beer, then she would answer "no" because she knows, that not everybody wants one.
Jerzy and Markus are correct. The question is 'Does everyone want beer?' If the first logician did not want beer, he would know the answer was "No." Since he answered that he does not know, that tells the other two that he does want beer. The same logic works for the second guy, leaving the third guy to answer "No" if he personally does not want beer, or "Yes" if he does.
If first one didn't need beer he would say no,so dose the second one:) So the third one's answer is yes.
It's the same with coffee (or anything for that matter) here in Sweden. :-D
I get it. Now that you guys explained it, I feel silly lol. Thanks. 
I canNOT believe you guys are actually trying to explain a beer joke.
It's not a beer joke, it is a logic joke. Works equally well with coffee, as Patrik said.
But the question is not specific enough. Does everyone want beer ? How can they know ? And the answer is probably NO.
Dear Adrien, the question is enough specific ...!!
The first want a beer otherwyse he could and should have answered NO .. The second too for the same reason ...
So the third may answer YES because he knows with certainty that they all want a beer. 
so, if it's "I don't. No" does that mean that they don't want to say no? So... yes? We are being true logicians here!
+Snail Erato no, if the word "everyone" is used alone without specification of a subset, then i consider the whole living human population.
Are we done beating all of the funny out of this thing yet?
Ordered three beers.
Question: does EVERYONE want beer?
Answers: neutral, neutral, positive.
YES, EVERYONE, means three 
im more concerned with the "waiter" assuming a drink... ever. 
I though (she) was just the nice friend buying the first round.
can "I don't know" be interpreted as a "yes"? this doesn't really make sense ...
+Adi Peshkess ur absolutely right
+stephan herschel because if any one person didn't want beer, then the question "Does everyone want beer" would be logically false, therefore anyone can declare no, but unless all but the last person say no then nobody can say yes, so all but the last can only say I don't know, before the last can say yes.
+stephan herschel The question is: "Does everyone want beer?"
Each logician only has knowledge of their own personal desire for beer. Thus, the first logician can only say either "No,"  if they do not personally want a beer, or "I don't know," if they do (seeing as how they don't know if everyone does, just that they do).
The second logician, being a logician, now knows that the first logician wants a beer, but still doesn't know anything about the third logician, so the choices are the same: "No" if the second logician doesn't want beer, but only "I don't know" if they do.
The third logician, however, now knows that both of the other logicians do, in fact, want beer, and so has the choice between "No" and "Yes," based on whether he/she/it (these cartoon characters are not of obvious gender) personally wants beer.

The humor arises from the difference between the literal meaning of that exact question and what is typically meant by it, that is, "Who wants a beer?"
i do want a if somebody ask in general if everyone want it (a beer)...and all say no...ill be everyone and ill say f... it
I agree with the general assessment (the first two's neutrals implies their lack of negative), but I think I would collapse on the scope of "everyone".  Everyone in the bar?  Well, what about the bartender?  Are there other patrons?  Do we mean everyone in the world? 

The proper way to have asked the question is "Does everyone in this set of three logicians want a beer?"
Does anyone ever answer questions like this in real life situations?  I either get the stink eye or the RCA dog.
It's called social cognizance. It's not a literal question.

Therefore the cartoon is wrong.  The 'joke' is ruined.
these days beers are available than water what a world???these issssssss
+Derek Colley 
Null doesn't really apply here. Assuming the bartender was using 'everybody' to refer to the logicians, the first one said 'I don't know.' This proves that he did want one, but lacked the input of the others on whether they wanted one. If he didn't want one, he would have said 'No', because he would know for a fact that not everybody wanted one.

The same thing applies to the second logician.

The 3rd, and final person realizes what happened with the first two, and recognizes that they both want beer. Since the 3rd person wants beer too, he figures out that everybody wants beer, and they can say yes.

That is why the joke is funny.
That's awesome :-) Unless you sit and way over-analyze it ;-)
The stripy lady could just be being assertive. 'This round is on me'! They don't have to drink them.
Note that, there are cases where the bartender will not get the answer how many beers are ordered ...
Just because she did not ask the good question .... hahahahaha !!!!
(Of course we admit that logicians always give there anwser one after the other.)
The four only  possibilites are:
I don't know, I don't know, Yes ==> Three beers ordered
I don't know, I don't know, No  ==> Two beers ordered
I don't know, No, No  ==> Impossible to know but at least one
No, No, No  ==> Impossible to know but less than three.
I couldn't help reading all this, but "everyone" is the name of the third boy I think !!!
This reminds me of a joke: A programmer’s wife sends him to the grocery store with the instructions, “get a loaf of bread, and if they have eggs, get a dozen.” He comes home with a dozen loaves of bread and tells her, “they had eggs.”
im so cool a because i have decided ..................
+Snail Erato if one of them said beer then not 'everyone' wanted beer. the first two said they didn't know because while they both wanted some, they couldnt say that everyone did as they didn't see everyones choice yet. the third logician used logic and deduced that one of them would have said no if they didnt want one, and they'd be right because all it would take is one for not 'everyone' to want a beer. therefore, the last could say yes because all three had chosen.
neenu entha cool o. how can i make u belive..but now  im happy a kiran
because not to have u after knowing fully about u
u will only come to know how long it exits
If either of the first two didn't want beer, then they would have said, "no," because if even one (themselves) doesn't want beer, then not everyone does. If they do want beer, they say, "I don't know," since they don't yet know the answers of the others. Since the first two said, "I don't know," they did want beer. Knowing this, and knowing that he too wants beer, the third logician now knows that all three want beer, so he answers, "yes." Three beers are ordered.
Whoever  did  that  little comic book, they  did a really  good  job. I  do comic  books myself.
You have to assume that by "Everyone", the bartender (I'm assuming that's the bartender) is only referring to the three customers, and/or that the bartender doesn't want beer. The implied answer would be yes, everyone wants beer - but if we're being as literal as possible, the answer can't be determined because we don't know exactly what the bartender meant by "everyone", or whether the bartender wants beer. 
I do comic books too. I do christian comics. Maybe I can show you some of my own  if  I  keep you  posted 

...... . .. . ..
V. . .
. .....
B... .
. .. .
.m m. . . . 
the first 2 don't know that the others want a beer, but they did want the beer otherwise they would have said no. the third one said yes because the others implied that they wanted one. keywords everyone
It takes a second, but the logic works.
+Torpedo Mouth 
In order to make a statement, everybody MUST want beer. If the person didn't want beer, then not all of them would want beer, and they would say no. because the first two said I don't know, indicating they didn't know about the other person(s), but they wanted beer, only the last person could conclude, since he too wanted beer, that they all wanted beer.
+Arslan Mir No. That's wrong. They want one, but can't decide for the other two or other one, depending on their position in answering.
Logicians are so much more effective than the usual pub goer ;)
I hope  you  do  many more  comic  books.
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