One day last year I was driving to school after not long passing my test. A driver behind my was flashing his lights at me, so I pulled in, and being tired, scraped my front left wheel trim on the curb, I hadn't realised I'd done it at this point though.
So I get out of the car and the other guy had pulled up behind me to tell me that my back left wheel trim looked loose. So I nudged it with my foot and it snapped. So i pick up the pieces of my now shattered wheel trim and put them in the boot (trunk? for the americans). After that a guy walking his dog points out that I had shattered my front left wheel trim on the curb.
So both wheel trims on the left side lost in roughly 60 seconds.
Anyway, to bring this back on topic, I had been playing loads of Fallout:NV and I couldn't comprehend at all that day why I couldn't just quickload to an earlier point and correct my error.