A lecture prank involving a choreographed fencing fight scene, mariachi band and lots of mustaches.
Btw, we didn't give the professor any kind of warning this was going down.
We pulled this off in an Organic Chemistry 2 lecture, at the University of Michigan, Ann Arbor.
There were some 18 people involved between the front and back of house personnel. Very complex, very theatrical, very good, and very funny.