They have an explanation for why a video game protagonist can survive being shot multiple times!
Work on your game-loading times, Valve.
Portal Lab Rat comic tie-in
Portal animation (x-post /r/gifs)
Playing with portals XD
Siri plays Portal is a funny video
Portal Lemon-ade Wall Display - "I'm the guy that's going to burn your house down - with combustible lemons.