We needed to sneak into a rich nobleman's manor in order to gain evidence that he was an evil motherfucker trying to kill the whole town that relied on his money to support its economy.
Our party, a halfling fighter, halfling dread necromancer, and half-elf bard had no idea what the hell we were going to do, as the place was heavily guarded. So, walking up, brazen as can be, when confronted with guards, we improvised.
The bard declares we're health inspectors, there to investigate claims of unsafe working conditions. We'd need to inspect the mansion's main floor, unobserved, as our findings were not to be revealed until we made our official report. He rolls godly, and the DM is cracking up with this ridiculous claim, eagerly backed up by the two halflings. With an additional corroborating diplomacy check from my fighter, the guards reluctantly let us in, and which point we ransack the place for clues, kill a bunch of were-rat mooks, find the noble in the middle of an evil ritual, and kill the fuck out of him.