I most commonly yell at horror movies. If it's a good movie, I"ll stay quiet aside from the occasional obligatory "DON'T GO THERE YOU IDIOT!" If it's a bad movie, I'm usually screaming and yelling at the characters like a madwoman.
I also quite often yell at my games. Or, weirdly, I make sound effects at them....Like on Prototype, when I'm jumping around I'll make effort noises...sort of like a tennis player...Or with hammerfists, I'll yell "BAM! BAM!! WHEEE!"
....Huh. And I wonder why I have no friends....
I'm like that too. The sound effect, I mean. Well, and the lack of friends, but what can you do?
I often find myself making wooshing noises when I'm flying around in games, and sometimes I'll narrate to myself about whatever the mook I just killed must have been thinking right before I killed him.
"Did that box just move? Nah, must have been the wind that probably wouldn't exist because I'm inside but whatever. Wait, where did it g-"