Nintendo DS Lite as a travel sanity device

I was looking for the entries in Lifehacker's Show Us Your Go Bag series and I noticed that many people keep a Nintendo DS Lite in their go bag. I realized that I can bring a DS Lite with me when I travel to drive away the blues and the torture of being in airports/airplanes. On my very last trip, I took the DS Lite with me and played Castlevania: Dawn of Sorrow. One of my flights was delayed by almost two hours; thank god for Nintendo. I had told everyone that I had given up video games, but I guess I can make an exception for traveling (yay, a treat!) (My new rule is that I'm only allowed to play my DS when I travel.)