Two skeleton gravediggers either side of a grave, grave has an infinity mirror in it. Using talking skeletons, one could say "I think you've dug the hole too deep" then the other replies "what do you think children". Use a sensor to trigger the conversation each time ToTs approach. I'm thinking skeleton 2's response will get the ToTs to look into the "grave". I have 2 full size talking skeletons. Now all I need is 1 infinity mirror, and ideas of inside; sensor system to trigger the skeletons; and the voice-over track.