I can't be the only one who immediately thought "face of Boe!" Put a costume mask in a jar then add water! Plan on putting a glow stick or submersible LED light in the jar for effect.
I want to share a tip we have been using for years on how to clean out a pumpkin in 2 minutes. Yes, 2 minutes! You don't even have to touch the slimy guts -- and you'll be ready to carve pumpkins with your kids in no time!