Santa Claus Detector

Tis the season for Santa Claus detectors, such as that shown in U.S. Patent 5,523,741.  With this device, a ribbon is stretched across the front of a chimney, and attached to the ring at the toe of the stocking.  When Santa Claus comes through the chimney, the ribbon activates the device, which lights up.  If it is lit when a child gets up in the morning, he knows that Santa Claus has been there.  Sounds pretty foolproof.

Santa Claus