Here's a modest little comic I did one day on the train. I take a little notebook along with me during my commute, and when I'm really bored sometimes I draw in it. The picture quality's not outstanding, but that's as good as it's going to get. I drew on the back of it, and some of the ink seeped through so you can kind of make out a comic I did on the other side.
NOTE: Click on the image to see at full size.