As for my choice of worst game, I know it is pretty much a Steam cliche by now, but it just has to be Bad Rats. Before it had become a cliche, someone gave it to me as a gift, and I decided to check it out because I didn't want to be unappreciative and never play something so kindly gifted to me. I got about 10 minutes into the game when I decided that I hated it with a passion and was going to delete it, which is pretty much the exact moment when it froze my entire system up.
I think that in some ethereal way both I and the program "Bad Rats" on my machine connected on a higher level, and we both decided to take our leave of each other in the most aggressive vindictive way possible. Like something similar to the movie "Tron". But instead of a helpful program trying to guide me through my experience on the system, I got a real rotten bastard throwing red discs at my head. Every time I see it on my list of games on Steam, I envision some son of a bitch shaking his tiny fist at me. Now I try to avoid ALL experimental lasers that transport matter, just in case...