Left 4 Dead. Not because it's not a good game, but because I bought it for PC and now my PC is so laggy (incidentally it's a laptop bought for university) that I literally can't even play five minutes of it. The cutscenes are all OK and I don't have this problem on any of my other PC games (save for online DoW Soulstorm, but that's usually because of the other PC's people are using). I just don't see why I can't play L4D? I can't even get a refund either because I bought it cheap in the closing down sales at Zavvi, and that's gone bump in the recession, so there's no point in getting the refund or a replacement. Should have spent my money on Half Life instead... (although I'm getting that soon via Steam, £25 total for every Half Life game and the entire Orange Box. Gotta love cheap things...

).