He appears to be Arabic judging by his email name and also the Arabic Coca-Cola can.I wonder what kind of muzzle velocity the little monster has? Good ole 'Merican ingenuity! (I hope, probably made in China!)
Sorry, I can't see the vid from work, but is it a small brass cannon? Only about 1" barrel? If so, Cheaper Than Dirt sold them a while back, and they might still sell them.
ETA, from 96firephoenix's comment below, it is the video I was thinking of. The cannons is NOT homemade, and was likely purchased from CheaperThanDirt.