Best +Git tip I learned in a long time:
gitk ORIG_HEAD..
after pulling a branch from someone.
You can also do:
git shortlog ORIG_HEAD..
git diff --stat --summary ORIG_HEAD..
as well.
And if things went wrong:
git reset --hard ORIG_HEAD
to revert the pull (although I thought there was some other way to do that, but can't remember it at the moment.)

Many thanks to +David Miller for that one, it's already proving to be indispensable.
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