This is a story I like to call The Special Stairs.
So my friends and I were playing a Pathfinder module called Masks of the Living God, using Pathfinder rules but with an Eberron world setting. As there were three of us, with one of us GMing, I and my other non-GM friend each played two characters: I had a human cleric and a Warforged monk (Warforged is a race of living constructs, basically fantasy robots), and my friend had a gnome sorcerer and dwarf rogue. We were all about 6th level at this time.
Our mission was to infiltrate a local cult branch and find court-permissible evidence of some of their dirty dealings so they could be shut down. We attended one of their recruitment events, feigning interest in joining the cult. They fed us drugged food (except for my Warforged, who doesn't eat and eventually consented to be willingly knocked unconscious by the cultists on duty), confiscated all of our equipment (this will become very important later), and gave us all standard acolyte robes and supplies.
We woke up inside the cult's castle, and given communal living quarters with all the other acolytes at the recruitment event, so we made small talk for awhile. But our dwarf decides he's not comfortable with us going around the castle unarmed and unarmored, and decides to sneak off and retrieve all our equipment. He knocks out a guard near the storage room where our items are kept in locked chests, steals his keyring, and reclaims our stuff. He manages to sneak back and redistribute our items, but decides he's feeling slightly reckless and sneaks off on his own to try and find information we can use to complete our mission. This is when it really starts to hit the fan.
In the courtyard, there was a set of stairs that led up to the living quarters and private rooms of the cult's leaders. Climbing these stairs was absolutely verboten, but since the dwarf had conveniently completely forgotten this, the guards at the top of the stairs were extremely unhappy. After trying to bluff and give some weak excuse about towels (it was funnier at the time), the dwarf is hauled off by the guards to the second-in-command's quarters, who is extremely pissed about the dwarf climbing the Special Stairs (as we have started calling them at this point), and sentences him to be brought down to the communal quarters and whipped in front of the other acolytes.
He is brought down to the acolytes' quarters and the guards are told to strip off his robes. The dwarf immediately knows that this is a serious problem, as his robes would be removed for the whipping and they would all see his weapons - equipment he was not supposed to have. Being discovered pretty much means a death sentence on the spot, so as soon as the robes are removed and the dwarf is naked, the rest of the team decides it's time to spring into action.
The gnome sorcerer opens by casting Entangle, covering the whole room in thick vines that make it very difficult to move, and conveniently hits everyone BUT the dwarf while screaming "He's getting away! Stop him!" Meanwhile my monk and cleric wade through the chaos basically hitting things at random. The gnome then casts Color Spray, which blinds and stuns anyone hit by them... which just happened to include the second-in-command who was overseeing the whipping. On the next turn, while the second-in-command was stunned, my monk decides to grapple and pin him. The GM decides, between being entangled, grappled, stunned and blinded, that the second-in-command counts as being helpless... thus making him a target for a coup de grace. And after saying "I got your stupid stairs right here!", the dwarf delivers.
At this point we decide that trying to infiltrate the cult and gain access covertly is out of the question, so we stage all-out war on the rest of the compound. These shenanigans include setting up a trap to knock the cultists off of a slippery ledge into a pit containing a giant snake, and turning my Warforged into a ten-foot-tall, two-ton robot who proceeds to roll down the stairs and crush anyone running up after us.
And that's how we utterly destroyed a module with a butt naked dwarf.