When I recieved my gold quarter eagle in the mail, I opened the package in the kitchen with such excited vigor that the coin went flying and landed inside the toaster. Yep...I still cringe thinking about that one.
At least you didn't do it deliberately. In a flea market in Honduras a guy "demonstrated" that the coins he wanted to sell me were real silver by throwing one of them at the cobblestones so I could hear the ring! Needless to say, I left the flea market without adding to my coin collection.