Had a kid try a block on the opening kickoff of a varsity game, and didn't get up. Coach came out and saw the knee bent a weird angle, and first thing he asks the kid, "Is that the knee you just had surgery on?" Kid's response: "AWWWWWW ****, yes it is!" We stood back and watched while the rescue squad guys got him on the board and into the bus. Delay took about 15 minutes. Kid even "instructed" the EMT's on how to handle the knee.