I thought this group might be able to tell some particularly stunning stories on themselves: you know, moments when you did something extraordinarily dumb?
For example:
Back in '85 (I was 14, which explains some of the dumbness), I went with my mother to France for two weeks -- she had a scholarship to study there for a month (she taught French, you see), so the costs of taking me were low enough to be manageable.
Anyway, the last couple of days of the trip, we had returned to Paris after a week driving around the country, preparatory to the return flight to the states.
My mother left me in the hotel room while she went to do laundry. I was excited because this was the first TV I'd had access to in most of two weeks (14 years old, remember?).
The TV was one of those where the channels were changed by pushing down a button, one button per channel, and the last one would pop up as the next one was pressed -- like buttons on old style radios.
After a whopping two minutes, I accidentally pushed down
two buttons at once, and they both went in and stayed until another button was pushed (the TV wasn't tuned to anything in this state).
You can probably figure out the rest of it -- it took me about half an hour of trying, but I finally managed to push down all the buttons at once (there were about 20 of them).
I basked in the glow of satisfaction from my epic accomplishment for all of fifteen seconds before it occurred to me that I had no buttons left to push to make them all pop back
out. 
Of course the worst part wasn't having to explain what I'd done to the hotel manager (who thought the whole thing was hilarious), the worst part was
still not having any TV to watch ... and, of course feeling like a colossal idiot for having invested thirty minutes' concerted effort in depriving myself of that TV.
Anybody else got a story they want to tell on themselves?