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Australian
Indoor-Rules Quiddich [sic]. From the next day’s Mac Hall newspost on the
topic:

A strangely high number of people have asked me for the rules to Australian
Indoor-Rules Quiddich, so here they are.

Australian Indoor-rules Quiddich is played with a dark hallway and a hard
rubber ball. The best kind is a rubber ball with a solid core and an LED in
the center that lights up on impact. Sometimes they give them away at trade
shows or conventions as a promotional freebie. The hallway should be as
close to pitch-black as you can get it.

Throw the ball at each other as hard as you can. That’s it. You are free to
defend yourself in any way that doesn’t make you look like a cringing wuss.
Use of bats is not encouraged, but they can be used for defense as a house
rule.

No score is kept and there is no clear way to win. Play continues until you
stop.