I taught my younger brother how to throw cards after I learned from an episode of the game show To Tell the Truth. The mystery guest could’ve been Ricky Jay, but hell if I know after all these years.
Anyway, he tried it with a military-issue hand mirror (a small, rectangular piece of polished metal), not realizing it needs flex to continue in its forward trajectory. The thing went up into the air and came down right into the top of his head. Not a huge injury, but definitely made him think twice about doing something like that again.
