QWOP is a simple game about running extremely fast down a 100 meter track.
QWOP has developed quite a following online, spawning comics, speedrun videos, parody videos, and weird Japanese homage videos where the man is replaced with a 3D schoolgirl on the moon. It has also been featured on the US version of The Office, and several times on the Japanese TV Show Angry New Party.
In 2016 I updated it to work with HTML5, so you don’t need Flash to play it. Should work fine even on a smartphone, using the on-screen buttons.
Play it online for free. (HTML5 or Flash)