The Machine of Lum the Mad.
The party went through my 3e version of watchers keep (none of them play baldurs gate) It took about 4 months of playing everyweek. From the very first level they were finding the scrolls that has the weird and cryptic clues from Lum. They tried to solve every level using them, getting very frustrated. When they finally found the machine and finally figured out what those clues were they had been carrying around, they used the one clue to open the gate to the next level....and then went through the portal. THEY DIDN'T USE ANY OF THE OTHER CLUES. uhhg. Every attribute had a +2 unnamed bonus as well as many other powerful permanent affects. It was basically half the treasure of the dungeon, and they were too scared to use it.