How about a BMX race in Texas?

My spleen. It was "fractured" meaning that it was all but ruptured, the outer lining managed to hold together for about 2 weeks. When it let loose the organ had healed enough that it didn't quite kill me. I was in the critical care unit at Brookes Army Medical Hospital for a couple of days on a morphine drip and an OR waiting for me at all times, with my blood counts being constantly monitored.

I bled internally quite a lot, to where the pressure on my stomach allowed me to eat very little at a time. For a couple of months I was scheduled for a CT scan once a week, then every other week, then monthly for a while. I was told not to step on a ladder and to be extremely careful on stairs because the slightest fall could kill me before I could get to an ER.

I was actually not told to ride ever, but I was told that I wasn't to even look at a bike for a year. I was cleared about a year and a half later and raced one more season, where I took 2nd in Virginia for my class, with the class winner being 17, while I was 33. I crashed bad again the final championship race and finished with a concussion and some really nasty road (track) rash.

Ah, the good ol' stupid days.