Did anyone here watch the film, "Yes Men"? I watched it because of a review by Roger Ebert. He said, 'Must be seen to be believed'. Yes Men is documentary about a pair of guys that do pranking on quite another level.
Here is a clip of them trolling a lecture hall full of college students, and some faculty:
Notice that they've passed out free food.
They have a mission, it's not pranking for pranking sake.