At the Cornwall national XC round a few weeks ago.
First my chain dropped off on the 2nd lap when I was sitting in 6th, and a few people that I knew I could beat came past. So I got all annoyed and pushed too hard on the descent, and put a hole in my rear tyre. So I blasted some gas in it, which got me around to the tech area, where I changed the wheel. My other wheels had heavier, tougher tyres on, so I thought I’d be alright from then on.
But I punctured again, in the same sodding place, going through a bit of water with some submerged rocks. I decided to put a tube in that time, as I only had one gas canister left. The time that this took threw any hope of a good result out of the window, but at least I’d be able to finish the race.
Nope. I hadn’t managed to get enough pressure in the tube, and pinch flatted the bastard. So I kind of gave up there, and ran back to the finish, coming in second last.