Thank Heaven for zombie movies. Now we're at least familiar with the concept of people eating brains.
Jokes aside, cannabalism--eating your fellow creatures--is well-established across the animal kingdom, as we explored last year with zoologist Bill Schutt.
He wrote the book Cannibalism: A Perfect Natural History. And for some reason, we have a taste for hearing the discussion again. It's not gross. Just don't eat breakfast while you listen.