[Jim S]

The worst I've seen was a running back who got hit from two sides just as he was planting after stepping thru the line. He got a twist fracture of the hip. Entire leg is point in bad directions.
He screaming the he'll never walk again, etc. I'm right there so I tell him to be quiet, the doctor's will fix you up. He's says OK and calms right down. For about a mionute. Then he starts up again. So I start telling he stories about "bad" injuries and how he's gonna be just fine. Calms down again. Another minute goes by and now the EMTs are there and he starts up again. This time I said "Hey that's about enough of that! These guys are gonna take good care of you until they get you to the doctors who are gonna fix you right up... SO ZIP IT!" him "OK sir"
I later got a thank you note from the kid and his coach for "my assurance, and help keeping him calm.

Second worst was a pass receiver running patterns in pre-game in Cupertino, Ca about 27 years ago. He went airborne to catch one. Hit the ground and started screaming. At the time I was an EMT and ran over to him. Looked down at his knee. The patella was around the back side of the knee, completely detached. Having had knee injuries I don't blame the kid for screaming his head off!