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Zombie movie

Not nonsense at all, it'll likely stick in your head (or brain ;)) because it's so crazy! And it teaches you the word brain.

Halloween party, maybe?

Maybe if you're visiting a restaurant that serves different internal organs :) "뇌를 먹어 보세요"

I eat brains..so me when ever im trying to make small talk

Not actually, many countries eat brains. https://en.m.wikipedia.org/wiki/Brain_as_food