Like many good software engineers I know, I love to write games. It's the whole reason I started coding in the first place. I have several games not really ready for prime-time, but I'm rather proud of Line Battles. Check it out, if you're bored.
I cartoon on occasion. It's something I started when I was about 12 and my mother decided to enroll my brother and me in drawing lessons. I took to it and could make a mean Garfield, but became less and less interested as time progressed. I started again only to seek refuge from the <melodrama>harsh realities of MIT graduate study</melodrama>. To give you a sample of my "work", just ask me.
I am also playing with learning a new language all the time. For example, at the end of 2009 I learned a little 日本語 (Japanese) because I attended HRI 2010, held in 大阪 (Osaka). I studied Japanese for about a month and became familiar with their phonetic symbols. It ended up being quite useful since there are many loan words in Japanese. I started learning Mandarin at some point (mainly because I realized I knew so many Mandarin speakers), but realized it was really hard (tones), and gave it a break. Most recently, a trip to Spain has motivated me to start learning Spanish.
Other than those things, I like to do what most might consider "more normal pastimes." I play video games on occasion and like to go out with friends. I'm a huge fan of Smash Brothers, so if you're a good player, please, send me an email and let me know. I would love to get together and play.