I used to be quite good at it when I was a kid.
I was more impressed with the ability of a guy I bought a boat from to open a lock. (the trailer had a lock on the hitch, he couldn't find the key). He went into his garage, got a hammer and a cold chisel, said "you hit these ones right here" - I was figuring that "this idiot actually thinks he can pop a lock open with one blow" - he looks like a banker or something. Well, it wasn't a blow. It was slightly more than a tap, and the lock popped open. I was impressed to say the least. His comment: "You learn these things when you grow up in Philly"