There's that guy who tried to hone his cylinders (from an Audi forum?) by running sand through his intake and running motor.
http://www.audiforums.com/forum/off-topic-5/hey-guys-please-help-my-mods-gone-wrong-80267/
There's the jet fokking black Lexus guy.
http://my.is/forums/f87/crashed-my-baby-147582/
There's the GSX-R guy who ran two bottles of NOS energy drink through his fuel system, instead of NOS fuel injector cleaner.
Read up to posts 32 & 33:
http://www.gixxer.com/forums/showthread.php?t=226570
The Ducati guys have that infamous watermelon guy story.
http://www.ducati.ms/forums/11-ducati-motorcycle-chat/22432-went-down-watermelon.html
Then there were funny stories like the college kid in AZ who moved his booted Audi into his garage using wheel dollies and then challenged the parking enforcement company to come get their boot back.
Couldn't find the link (looks like it might be down due to legal issues), but it was over on vwvortex. Google booted, Audi, and APS and you can find other links telling the synopsis. But to read the epic blow-by-blow was hysterical as it developed over several days.