Talking during scenes. Not the dirty talk from the whore's piehole, the incessant talking from the director or a 3rd party. Dave Cummings ruined a whole series doing this. And in every "college porn party" scene, there is some douchebag bystander in his askew baseball hat yelling at the top of his lungs, 'cause he ain't allowed to touch the whores. STFU.

Pass goes to Powers because his scenes are hilarious rather than strokeworthy, and the banter just adds to the fun.