Highlights of the last DnD campaign set in Sigil I ran:
- The players get all information from a bunch of psychic rats in a trench coat
- They accidentally teleport a zombie beholder into the Smouldering Corpse bar
- They briefly work in a restaurant kitchen that has a portal to Faunel to source rare meats
- They tame a couple of dogs in an anarchist's house (the dogs are intellect devourers)
- Instead of a final boss fight, they give therapy to a depressed githzerai in Limbo