Heres a few....
Chewing with your mouth open. Its never necessary.
Slurping. I don't care if its spaghetti noodles, a Popsicle, or your drink. There is no reason for it.
Cracking knuckles or neck. Just sounds gross.
Ok - I said a few, and a few is three.
I am going to take a picture for my next pet peeve - and will post it later today. Its stupid, yet funny. But its gotta be noted!
Till next time..