Last game my group was clearing out the top floor the dungeon. This was actually well after that had found the kids and returned them to town. In fact they had even dealt with a Fey issue as well (Wingclipper's Revenge from Dungeon) so they were really just doing a thorough clean up to make sure they had gotten everything. Well at this point they had found the magical gauntlet (can't remember its name) and had a magic eye from the other adventure. They didn't know what either of them did so were reluctant to do anything with them, especially the eye.
Well then comes the Allip who drops the Warblades Wisdom down to like 2. They have no restoration at the time so they are standing around deciding what to do next. The Warblade, who is carrying both the gauntlet and the eye, decides that the gauntlet must be something cool because its magical and puts it on. They party only half paying attention to him turns to see his hand curl into a permanent fist. The Warblade thinks oh cool in his Wisdom impaired state. Then the Druid makes the off-handed comment of, "what are you going to do next cut out your eye and put the magic one in?" Well before anyone can react the Warblade cuts his eye out and pops in the magic one. The group is dumbfonded at this point and the Warblade just smiles, well until the next day when they fix his Wisdom.
Now first this was all player driven. I had nothing to do with it. I know and the player knows that a Wisdom 2 doesn't make you completely stupid but he figured the gauntlet would be harmless enough. What they didn't count on was the off-handed comment the played to the Warblades ego. You see he is a halfling Warblade with a little man's complex so he rarely turns down a challenge. He took the eye comment as a challenge. Needless to say the player is fine with it all and it made for a great moment in the game.