Doodle or Die is sort of like all those other drawing games you've seen and played, with one difference: it tends to be a lot funnier, because it's built around the idea of multiplayer "chains", whereby people write something, someone else draws it, then someone else bases the next inspiring line on the image that's been drawn.
It leads to rabbit holes that you'd think shouldn't be approached, but are actually awesome visualisations of the kind of things five year-old boys scream in a playground. Drawn, I'm guessing, by a lot of 30 year-old men.
Doodle Or Die [Site, via Laughing Squid]