Why do it? Simple, because you can! To all those people saying we as a race have now hit "new lows", you have lived a VERY sheltered life if you think this is a new low. I do believe that nuclear & chemical warfare is far, far, FAR lower than anything this guy has ever done.
It's a watch FFS! If he wants to smash it with magnets, grind it up into 1,000,000 pieces, eat it, then crap it out, then he has every right to do that. Those people who think it's "brainless", "retarded", "a new low", etc really need to get out more. It's just for a laugh and nothing more.