In racing, I've had several damn things happen, from breaking a brake line which squirted fluid on the exhaust so it evaporated, leaving no indication there was anything leaking until I hit the brakes and nothing happened, to losing an axle nut in qualifying, running the rest of the session unaware that anything was wrong, and pulling the wheel off with one hand in the paddock.
This was the damndest.
First, in qualifying I was only .2 seconds off the pole speed and I diced with the polesitter for 4 laps before driving away from him. I felt pretty good about my chances.
The first attempt to start the race was waved off, so we took another lap under yellow to try again. As we bunched up and slowed right before the start, I had to brake hard. The brake pedal BROKE OFF.
Like I said, the DAMNDEST thing.
I limped it back to the paddock, looked at the piece of pedal, and found it had been broken before and someone had braized it back together. It was painted over and I had never noticed it, let alone imagined that someone would actually cheap out and "repair" something as critical as the brake pedal!
Thanks to that person, instead of the champagne of victory, I drank the tequilla of dissapointment.
Time to buy a new pedal cluster and go beat some ASS at the next event!