It seems that a couple of years ago, a group of 30 Canadian skiers executed a simultaneous backflip to establish a new world record. Frankly, I had no idea that backflips on skis were any sort of world record at all; but in case you missed it, here it is.
Looks like they enjoyed themselves in the process, too. You can read more about the record here.
Peter
I'm the third from the left.
In only two tries? I'm impressed!