I thought this “lecture musical” was funny—maybe it’s old news. The professor looked like such a good sport and the students were having so much fun. If you like the incongrouous (sp) you might enjoy it:
http://www.youtube.com/watch?v=3SwhzFsuvQc
Since none of them were actually in that class, I guess it was a lot easier for them to make their big exit stage right.
djm
I had a bilogoy prof who would have cracked their asses sideways with an 8 foot pointer she used on sliding blackboards. 
I will say this, the kid in the green shirt had some grande huevos to even start singing the song. 
that was incredibly hilarious 