For pure visual entertainment it has to be the backflip for me, I've seen a few done in MTB clips and pics, plenty of guys doing it in BMX vids(never had the balls myself , even jumping into the river off a wooden kicker on my BMX) and then watched Brian Deegan do it at The Crusty tour on his MXer and well fuck me that trick is insane.
Although if that pic of of the "tour de france" peliton gap is real, ill gladly give that first place (hahahaha take that you road hogging lycra pussies)