I set up some fake gravestores, green floodlighting, smoke machine, spooky audio with a pneumatically operated coffin. A sensor detects people approaching and opens the coffin door. Inside is a skeleton illuminated with green light.
When the doorbell is pressed, the skeleton is raised from the coffin, the lights go off, a thunderclap plays and a strobe light flashes.
See http://funwithelectrons.blogspot.com/ for the full story.
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