Fine. When I was a kid, I "raced" bmx. Never hard-core, but we had fun.
There was an open field near my house that we build "The Bowl". This was a hole about 100 feet deep (probably more like 5 feet in grown-up measurements) that had a near vertical launch. We used to get HUGE air on my Mongoose. OK, again, probably two feet of air, but it felt like we needed oxygen masks! Anyway, I landed hard one day, and ended up sitting on the rear wheel, while it was spinning. Think about the direction the wheel would be spinning and what happens if you sit on that. Yup, Crotch, right into the seat tube. Adding insult to injury, crashed hard because I lost all semblance spacial awareness due to pain!
That's about the most embarrassing I got - other than being generally slow!