http://blog.makezine.com/archive/2010/09/tim-oreilly-rides-the-jet-ponies.html

This ride, built by the dastardly danger-hackers at the Madagascar Institute, scares the daylights out of me. But some men are braver than I am. Like Tim O’Reilly (yes, that Tim O’Reilly) who didn’t seem too apprehensive about straddling a pulse jet welded to a glorified swing set. I don’t know about him, but my heart is still racing!