Mom always said not to play around a hot iron. But extreme ironing takes that risk, and then some. Participants perform an everyday chore in the least everyday ways, putting themselves in danger in the name of wrinkle-free fabrics. Outlet not included.
Volcano surfing is like snowboarding, except the soft powdery snow is sharp volcanic rocks and the mountain might explode.
Also known as "Faceplanting: The Sport," mountain unicycling combines the best of mountain biking, the circus, and a weak sense of self-preservation.
While normal tubing is fun and easy (everybody can do it!), its airborne variant "kite tubing" is fun, easy, and has made people die (everybody does it!).