Mandatory fun

From the unofficial Duke TIP Wiki

Mandatory fun describes activities which TIPsters must attend. At all campuses, TIPsters must sign up for activities each night.

One occasion that defines this perfectly. It was at Davidson Term II 2004. The TiPsters were promised an entire Friday Night of free time but alas! Minds were changed and a quick scavenger hunt was organised. It was mandatory. It was supposed to be fun.

Basically... mandatory fun is very unfun, it is what RC's subject TiPsters to when they have nothing else planned. Mandatory fun is exactly what it sounds like.