Being a bit of an actor/director, I must admit we pulled some rippers out of yr 12 experimental theater class, one of my co-dependant brainchildren being..
the agent skit
To setting the scene:
First off, we had 6 "agents" dressed in dark suits with glasses and earpieces. Looked very much like your stereotypical "G-men" from any shadowy government organisation.
Secondly, we had our runner, who was dressed like a student who was carrying a briefcase and looking very shifty.
Thirdly, we had a planted waitress at a cafe, carrying a metal platter with teacups, saucers and the works for 2 people to have tea. dressed like you'd see at any cafe.
The plan:
The plan was for the student to walk up the main shopping plaza road, slowly with more agents starting to follow him. He'd sit down at a cafe and the agents would sit there, with newspapers which had giant (try 12"x12") holes cut in them that they could watch him through. Finally, after 5 agents were following him, he would start walking towards the police station, where our 6th agent would emerge and cause him to break into a run through a narrow alleyway between two cafes, crashing into our waitress and causing a very loud crash. As he started to run, we started getting maybe 200 people watching us from their seats at the nearby cafes. You'd be surprised too; out of nowhere, 6 big men in dark suits start chasing this student who's carrying a shiny metal briefcase. After being subdued to the ground by the 6 suited men, I picked up his briefcase, touched my hand to my ear and conferred with the rest of the agents and we all walked off in separate directions. I had the pleasure of walking back the way I came, with about 250-300 people watching you it's an eery experience. The best part of the whole prank? Hearing some skateboarders tell and old man who was asking them what happened
"yeah, and suddenly out of nowhere these 6 dudes start chasing this one guy"
needless to say, it's the best bit of social-errorism i've ever pulled