Regrets

Have you ever traded a game in and regretted it later?  I dont trade games very often.  Normally I just hang on to them but once in a blue moon I get rid of one.  I sold Forza 2 and my steering wheel on ebay a long time ago and this weekend I had the urge to play.  The game is fairly cheap now but I never could play it until I got the steering wheel.  I just don't see myself going back out and getting another steering wheel just to play it again. I also don't see myself picking up the game and playing it without the steering wheel.   Any games that you have regretted getting rid of?