Instructables and ThinkGeek love a good prank, and in the spirit of the season, we're offering a bounty on the best Instructable that surprises, stymies, or just straight-up annoys your target.

The prank can be simple or complex, involve yarn or a supercomputer, but it must involve some physical object that you make for the prank. Extra points for originality!

The 1st place winner will win a $150 ThinkGeek gift certificate, an Annoy-a-tron 2.0, and a Phantom Keystroker V2. Two second place winners will each receive $50 ThinkGeek gift certificate, an Annoy-a-tron 2.0, and a Phantom Keystroker V2, and 6 runners-up will each win an Instructables prize bundle.

Winners will be determined by the evil ThinkGeek Overlords after a round of user voting.

Every dastardly plotter is a winner in our book, so each entrant will receive a ThinkGeek coupon code for $5 off $25+ or $10 off $40+ orders.

We'd wish you all luck, but it's probably your friends and family that will need it most. BWA HA HA HA.

Multiple entries are accepted and encouraged, although each entrant can only win one prize. International entries are allowed.

(Official Rules)