Is it possible? Has anyone done it?
http://unicyclist.org/cont/freestyle.cfm
I don’t think anyone has ever landed a flip with a unicycle but there are some vids here of Trevor Scholfield (unicycleboy) attempting it. He can also do a flip dismount.
Someone else on the forum here also tried a backflip.
http://www.unicyclist.com/forums/showthread.php?s=&threadid=34732&highlight=backflip
No offence to trevor, because he is an awesome rider(as shown in Unirogue) but all he does is a back hand spring off the uni. He would have to flip off with out his hands touching the ground for it to be a backflip. I have tried a backflip on my trampoline on a uni but after many faceplants and very painful landings I have put it on hold. But I bet someone soon will be able to backflip off a drop and land it.