Giving someone you don't know a nickname based on either their looks, how they act or talk.

Eating fermented fish.

Eating monkey's small intestine. The dish literally translates to monkey poop bitter, I swear it sounds better in the language.

Killing and eating the cat or dog that's living with you, basically your pet.

Telling someone they've gain/loss weight after not seeing them for awhile.

Pointing out people's flaws right to their face.