hi guys and gals! check out "piston exits engine" on youtube. unfortunate but dare i say it, funny!!!!!!

I take it you mean this one:

Piston Exits Engine

Ive seen this before and i have no doubt that its not a piston.

If it was it would have come forward through the steering head and not under the tank - i reckon its nitrous which backfired through the intake and blew the carbs and its the airbox, or part of it that you see fall to the floor, not his hand as some people seem to think.

The film is cut short so everyone goes "oooh fuck he's lost his hand".....yeah right - a blown piston wont have enough force to come through the bike and then sever someone's hand