Because I finally started playing Portal, on a borrowed Xbox. It's so good! And now I get all the jokes from like ten million internet years ago about the cake being a lie.
I haven't finished it yet though. I'm stuck on level 18. Stuck to the point that I'm debating looking up what to do, but then that feels like cheating and my eventual victory will feel hollow.
ETA: I feel I should add that practically all of my gaming experience has been computer games (and to a lesser extent, Super Nintendo), and therefore I am absolutely godawful at the controls. Makes things tricky. I am constantly falling off things, getting trapped... I'm pretty sure the hardest part of the game is not intended to be jumping onto platforms, but that's like my kryptonite.