Here's a cookie jar you don't want to get your hands stuck in - the Shockolate Vault designed to keep you away from your goodies.Not recommended by me as a diet aid, definitely recommended by me as a gag gift, the Shockolate Vault, can be set to "protect" your valuables or goodies for a given period of time. Try to get to them before the time is up and "there will be shocking consequences".
Would make for some interesting, amateur science experiements.