Here's a quote from Wikipedia (click here to read the full article):
"Extreme Ironing (also called EI) is an extreme sport and a performance art in which people take ironing boards to remote locations and iron items of clothing. According to the Extreme Ironing Bureau, extreme ironing is "the latest danger sport that combines the thrills of an extreme outdoor activity with the satisfaction of a well-pressed shirt."
Part of the attraction and interest the media has shown towards extreme ironing seems to centre on the issue of whether it is really a sport or not. It is widely considered to be tongue-in-cheek."
There was an Extreme Ironing World Championship in 2002. Or not :-).
I suppose my biggest question is what kind of iron is used in extreme ironing? I'm still hunting for the perfect iron...