what is your pettiest complaint about a coworker?

one of my coworkers is truly aggravating and unpleasant to work with. there are many problems i have with him, but the pettiest has to be the way he types. he attacks the keyboard in a way that i can only describe as ‘agitated spider’, using just his index fingers and flailing his arms about like a muppet. what are your petty complaints about the people you work with?