Ok, this one's because I need a laugh. I found it on my computer recently, but this is a doodle I drew a long time ago for a friend who used to jokingly say "Do my homework!" And whenever she said that, I would grab a pen and scribble something as silly as I could come up with on the nearest piece of paper (usually a cafeteria napkin, but this one happened to survive and be scanned because it was on an actual piece of printer paper), label it "So-and-so's Homework, by Elizabeth," and hand it to her. That particular time we had been talking about goats and bicycles for some reason....
Edit: This sketch is now available on a coffee mug, just because. Find it here.