Class is boring. However, so is Sudoku after the fifty millionth puzzle (they're still just numbers!) If you want something better to do, I highly suggested checking out Tag, which is one of the most innovative free online games I've seen in some time. 

It's similar to Valve's Portal, in the sense that you're not using a typical weapon, not killing people and purely trying to get from point A to point B. Different colors of paint have different effects, and you'll have to figure out a combo to get yourself to the end.

Tag is a 60 MB download found here, and it's definitely a good way to kill the majority of an entire lecture. No need to thank me, just doing my job. The video above is a full playthrough demonstration of everything you need to know.