...on the WTF list is almost cheating, because the Japanese come up with the craziest stuff. In fact, Japanese TV is probably the all-time WTF video-collection ever.
That said, I think I'm allowed one Japanese link a week. This one comes from the ever-vigilant Daddy-san, who has usually his, um, oculus open for WTFness.
Here you go, the Japanese toilet prank. Madness, really. I have a thing for the toilets in Japan, but in a different way.