Kermit and Miss Piggy watch a Punch and Judy show. Miss Piggy thinks it's too violent, but Kermit defends violence in artistic expression. This exchange immediately followed by two incredibly violent scenes.
Also a bit of a Celebrity Paradox, in a way, as Kermit is defending the artistic merits of puppetry in the face of Ms. Piggy's criticism. As in, puppets arguing about puppetry.
In a movie that features incredibly well-done practical effects and, indeed, some puppetry, plus has a cameo by Frank Oz itself. This one is a whole fridge brilliance bomb.
In the finale, were-David bites the head clean off a London policeman as part of the Piccadilly "disturbance". Had David not been killed just minutes later, would there have been a decapitated corpse and its talking head among the victims next time David encountered Jack?