Umm, this guy is riding a snowmobile across a lake.
No seriously, that's what he's doing.
Granted he is a professional stuntman (a member of the Stun Freaks Team according to the caption on YouTube) and this is a promotional video for the GoPro camera, but STILL.
Oh and did we mention there's a FIREBALL 37-seconds into this video?
SO yea, this guy is riding a snowmobile across a lake.