On two occasions I've had RD cables break going up some stoopid 10% grade, both times out in the country ~15 miles from home. In both cases, I ended up walking the hill and then having some extra fun sprinting rollers to get back home. I'm a bit more vigilant about keeping track of mileage on my cables now.
When I was first learning how to wrench, I had a left side crank arm come completely off. Fortunately, I was about a mile from home. I quickly learned about proper torque.
I've also had a couple of run-ins with vehicles. That resulted in literal limping, as I'm too cheap to pay for an ambulance if I'm able to walk.
The totally busted tire (before I learned how to boot tires) resulted in a ride home. From a stranger. Nice guy.