Have you ever been somewhere quiet, like in a full testing center, and realized, "Hey, I could yell really loud right now"? I have no idea why anyone would do such a thing, but the impulse is there all the same.
The urge to yell strikes me most frequently during prayers in church (terrible, I know--is this some sort of spiritual deficiency on my part?), during concerts, and, occasionally, during movies. In fact, when I was watching Harry Potter 4 for the first time, I had to stop myself from yelling, "Don't do it, Frank!" at the beginning. It was a midnight showing, and I wasn't sure if the audience would laugh or be annoyed, so I just kept silent.
On the other hand, I do tend to bust out the opera singing in parking garages and parking lots late at night, and I like to make fun noises down hallways and chambers that have a good echo. I suppose that will have to suffice for allowable distruptions for now.