Nasubi. I find this incredibly hard to believe, but supposedly Japan had a reality television show in which they locked a man in an apartment until he won $10,000 in prizes by mailing in postcards to contests. They gave him no food and no clothes, no furniture, and no entertainment. Anything he wanted to eat or wear he had to win through contests. They didn't tell him he was on camera being watched by Japanese television viewers. (Link from freaklogl)