In the first incarnation of the movie Scream, at the part when Billy throws the phone at his partner in crime and he screams “You hit me with the phone, you d*ck!” , Billy wasn’t actually supposed to hit him. The fake blood all over his hands was so slippery the phone slipped out his hands, and his partner was actually screaming at him because he hit him. They decided to keep it in, probably because it showed how they didn’t really like each other.