Bum Sports
Bumlifting:
A physics lesson sport, which involved admiring the peculiar ability of the four geeks on the desk in front (nerd row, like death row see) to sit upon their stools, arses thrust skywards. There was no real points system, but kudos was given to a particularly protracted or stylish bum lift. Big James Canton normally won, his formiddable behind seeing off the challenge of weedy Joe Chadwick.

Bum Sliding:
Possibly already mentioned; involved sliding along the edge of tables, with only the arse having any contact to the surface. Advanced sliders knew all the tricks - tables pushed together, and polished with the help of some ingenious soul who found a can of Pledge, a lengthy run up, and good feet clearance could result in reverse bum slides, 360 bum slides, or maybe the coveted "one cheek". Fantastically, a misjudged slide would end in a cartoony flail into the nearest wall.
written by Sc*tt Do*glas, disapproved by Phil