I don't remember if I voted on this all those years ago but I thought about it the other day and threw it at my players. It was an item left in an alchemical lab of a deceased sage. They found him dead along with a few other notable people in the city together.
The were searching his tower for information regarding a particular issue they were having when they came across his lab. Pocketing a few items, the thief of the group tossed the box in his satchel hoping it contained riches or items of magic. He has broken four of his lock picking tool kits and is attempting to find more. He swears that the fact I am not letting him, open it means there is something in it I don't want him to have. It's fun.
Thank you for creating this pleasurable tool of torture. Go to Comment
Fun and twisted. Combined with a pc that has the curiosity flaw (or better yet a player with it) you have every excuse to send the pc running across the world in search of know-it-all sages, magic keys, and anything else they think may open it. (Of course once they *do* manage to get a deity to open it or find out there's nothing inside they may well try and fit the gm in any conveniently nearby box, depending on their sense of humor.)
Oh and Pieh, do me a little favor and put your idea up as a sub linking back to this one so I can give it a proper vote and comment (+1 is too little for the idea). It's good enough it it's own right to stand alone.
Edit: One little question, Why isn't this a golden submission yet? It certainly deserves to be one. Go to Comment