Bike related - none (knock on wood)
Other - Most recent were 2 within a 3 month timeframe because of a crohn's flareup. There's not much they can do for you other than IV pain killers, fluids and anti-nausea meds to stop the projectile vomiting. They do a CT scan to make sure you're not obstructed, let you lay there for about 7 hours then send you home. It's kind of weird, they ask you if you want to be admitted. Um, NO. 
Other than those, I haven't had many. Once for a dislocated kneecap when I was a teenager. There may be others but I can't think of them, so they probably weren't all that eventful or traumatic.
"Only the meek get pinched, the bold survive"