Well, I've got two stories, each about a well. One is from when I was about 8, the other was only a few years go.
1: My cousin and I would play D&D...kinda. We'd have a character, some stats that really didn't mean anything, whatever. We were 8, we didn't really care. When your character died, that meant it was your turn to DM. Well, I'd been playing for about a half hour, and apparently my cousin was bored of DMing, so as I passed by the central well in town, a decently populated town, mind you, a large green tentacle came out, grabbed me, and pulled me into the well, and I died. That incited an argument and we didn't play for quite awhile afterwards, lol.
2: This one still bothers me. A friend was DMing, and his adventures are usually full of all kinds of weird





, so they're much more fun to play at night. At one point, our characters had been wandering through a desert, and were running quite low on water. We spot a little rundown house in the distance, with what looks like a well. After we attempted to disbelieve, (as it could have been a mirage,) the well was still there, as was the house, so we went on over. Being adventurers, we helped ourselves to the water, you know? I went first, while the others tried to investigate the house. As soon as the bucket of water was close enough to reach, it triggered a trap which launched me head first into the well.
But that's not all. Then it seemed I was falling, and a spider was approaching me from above. Naturally, I hit it with my weapon. Then it shatters, and I'm falling from the top of the well again, with the spider approaching again. I was in that well for roughly 45 minutes real-time, done everything from attempting a disbelief (which didn't work, mind you,) letting the spider bite me, (in which I was poisoned,) among other things. I really don't remember how I got out of there, I kinda blocked it out.
I guess though, that's more of a stupid trap than a stupid place for a trap. Then again, an old guy lived in the house, who frequently got water from his well.

But since then, my characters avoid wells at all costs. And I will do so forever in the future, *nod*