Next to dancing, the Laugh emote is what I look forward to using the most. Can't find something? Have a giggle. Dude walks past wearing LEGO colored armor. Chuckle. A conga line off of the Divers Ledge in LA? Whip out the roflcopter.
But this? This I have to see in game. Be ware though...when I get a chance to roll one of those things, I am going to be laughing my short butt everywhere. *ponders if it works underwater*