Omg this is the bane of my existence. I hate people that eat in class. If I can smell or hear it AT ALL then it isn't appropriate for class. All the people that do this in my class are normal humans, but still. And I personally hate the one you're ok with: granola bars. There is no such thing as a quiet granola bar wrapper. And all these goddamn girls in my class just (crinkle crinkle crinkle) break off a bite sized piece, then 5 minutes later (crinkle crinkle crinkle) another bite sized piece, then 5 minutes later... I just want to scream "JUST TAKE THE WHOLE BAR OUT OF THE WRAPPER AT ONCE YOU FUCKTARD!". If you don't finish it, you can stuff it back in after class!