When guests arrive, hand them printouts with a triangulated grid of your home, highlighting the location of bathrooms and porches.
Seat the guests so everyone has to do that over-the-shoulder thing when they look at each other.
Edgar was the best at this.
Hand out little mini suitcase nukes as party favors
Not real ones, of course. But little tiny plastic ones from a dollar store and fill with a mousetrap and glowworm candy.
Yes I love this show and it's on in TWO hours!