The strange and remarkable film Hands on a Hard Body, about a contest at a Texas car dealership wherein the last entrant left touching a truck gets to keep it, is available on Google Video. Entrants get periodic bathroom breaks, but as the contest stretches past 24 straight hours, madness starts to set in. A really amazing film, as recommended by Dr. Manhatta in the Docs thread on the board.
Kottke.org adds that the contest was suspended in 2005 after an entrant killed himself after pulling out.
Also very much worth checking out is the episode of This American Life which covers the contest.