Chinese finger trap

A Chinese finger trap (also known as a Chinese finger puzzle, Chinese thumb cuff, Chinese handcuffs, and similar variants) is a gag toy used to play a practical joke on unsuspecting children and adults. The finger trap is a simple puzzle that traps the victim's fingers (often the index fingers) in both ends of a small cylinder woven from bamboo.

Physical appearance
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Season one
Fred Jones put his index fingers in one, while the gang and Lindsay Pagano explored Rufus Raucous's hidden room, underneath the Spectacular Spackle Dome.

Appearances

 * What's New, Scooby-Doo?
 * 106. Riva Ras Regas