Um actually, according to the warning label on jumper cables, you connect negative of the bad battery (or a good body ground it doesn't matter which), negative of the good battery (or ground), positive of the bad battery, and positive of the good battery. The car doesn't have to be on, it just speeds up the process and takes away the risk of you losing enough power that you can't start your car either. With modern cars its unlikely you'll find a good body ground since everything is covered in plastic or paint, so you're best bet is just to connect to the negative battery terminal
You connect the positive of the good battery last since that is the only dangerous one in this situation since you don't want live cables hanging around, you want them to all be connected before connecting to the live connection.
Also, if you do it the way the chick said you will destroy both batteries, your cable will heat up, melt then catch on fire. Don't let chicks fuck with your car lol.