I've wanted to start a campus organization devoted solely to doing stunts such as getting a bunch of people to spend time "airplaning" (the run with arms spread thing) while singing airplane-related songs in public, or running a blood drive with a Hollywood horror monster theme (everyone's dressed up as really cheesy versions of the classic horror monsters). This is mostly because I think it's the best way to do the things I want to do without causing people to call the cops on me. I have a bunch of rediculous public stunts I want to do but would need some work to actually do.
As far as airplaning, I do it on occasion, though sadly not as much nowadays. I'd do it more often, but I like to do it with friends. (I'll do it on my own, but it's so much better when I can embarrass someone else too.) Likewise, any option to put on a silly costume is a good one. Also, I have once played Gargoyle (sit on a wall motionless, then jump out when people approach) for 2 hours straight. It was a glorious night.