What the title says! Share experiences of stupid dungeons (as in, bad at being a dungeon) you've been deployed in.
I'll go first! For me it's gotta be the School That Was Just Five Math Classrooms (#441031 in espDB, if you're curious). The monsters were teachers, giving bad math lessons, and some other school staff. They got annoyed with us when we took the civvies out of class but they didn't... really put up much of a fight? There was a security staff that tried to tackle our hitter when we went for the core, which was on a pedestal in the principal's office, but that was it.