I think one of the funniest things I’ve accidentally taught my parrot is yelling “WHAT?”
The best part is that if he says something weird and and someone else says “what???” he usually repeats what he just said.
Like just now, I was cooking in the kitchen and he heard me boiling water so he asked “you wanna noodle?” but I couldn’t quite hear him so I yelled “WHAT” and he repeated “you wanna noodle?”
Mostly he just likes yelling it, though.