I don't really like them much, but Chart-Pak markers are fun to play around with. Jake showed me a few things about line weight on these, so they became a lot more valuable because of the lessons they represent.
I have taken to doodling during lengthy lectures, this being the product of one such occasion.

Angry Drawings

I would say that I was very angry when I drew these two, but that just doesn't quite do it justice.

Birds

These are drawings for one of my group sessions in Patrick's history and theory of architecture class.