I once ran a one-shot game where I handed the players 15th level characters and had them hold off an enormous army for as long as possible. Among other magical goodies, I had given each character an immovable rod. No one had any immediate ideas on how to use them in a raging melee, so the Bard asked if he could hold onto them. No one had any problems with that.
The commander of the enemy Army reveals himself; a Great Wyrm Black dragon, with some obscene amount of levels in Sorcerer. Basically, an unstoppable juggernaut.
The guy playing the bard has to leave early, so he decides to nobly sacrifice himself so the others can regroup. He uses his Suggestion bard ability to convince the dragon to devour him whole (a suggestion the dragon was all too eager to do, anyway). As he died, ravaged by the dragons' acid gullet, his last action was to activate all 5 Immovable Rods...