Custom Super Mario World levels set on auto pilot are mesmerizing. Like watching a Mario powered Rub Goldberg machine.
http://www.joystiq.com/2007/08/22/dont-move-hacked-mario-world-levels-play-themselves/
Note for trivial posterity:
page with like a dozen embedded videos showing how much free time some folks have ;)
http://www.joystiq.com/2007/08/22/dont-move-hacked-mario-world-levels-play-themselves/
original "discovery"
http://www.joystiq.com/2007/06/30/todays-most-imprressive-boring-video-automatic-mario/
btw WOW, some of those really show an understanding of the really weird quirks, down to the pixel level, of the engine. I wonder what the Japageniuses think of these kind of hacks (i.e. "using technology in a way that the original inventors did not intend and/or foresee" e.g. #1 of the three posted by this user (http://www.youtube.com/profile_videos?user=siki343) :o
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bonus video: hacked ORIGINAL SuperMarioBros (not World) (!) (http://www.youtube.com/watch?v=A6Oy2iNABeM)
ROFL this is some seriously hard Super Mario level hacking! (http://www.collegehumor.com/video:1756133)
more here (http://www.youtube.com/results?search_query=Hardest+Mario+&search=Search)
All 4 levels in the mod: complet'd! (http://www.youtube.com/watch?v=_9JrEeS6484) :o