Lethal Card Thrower’s Amazing Demonstration [VIdeo]
There are a lot of skills that I would describe as useless. Watermelon seed spitting comes to mind immediately but they have a world championship for that. Stacking and unstacking plastic cups is another activity that appears to have real use, but they have a world championship for that too.
I don't know if there is a world championship for business card throwing but if they did, this guy would probably be in the finals. As you can see, he can do more with a business card than a Cajun Mom can do with onions, bell pepper and garlic. It's pretty amazing stuff even if I don't see how you could make a living doing it.