Image: Nick Woolsey spinning, photo by Alex Grunenfelder (Flickr)
Remember how fun it was twirling things when you were a kid? These people never outgrew that - in fact, they combined their love of twirling with fire to create a performance art called Fire Dancing [wiki] (or Fire Spinning).
Here's a fantastic Fire Poi Dancing photoset on Flickr, just to show you what can be done if you like playing (non-destructively) with fire. More info at Play Poi. Kids, don't try this at home.
http://www.flam-chen.com/
http://www.unifiredance.com/