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A trap is one of the hallmarks of Mystery Inc. when they are on a case. Usually thought up by Fred Jones, these would range from simple to extremely elaborate. Most times however these traps would fail due a mistake by either Daphne Blake, Shaggy Rogers, or Scooby-Doo. As a result the will would be caught due to controlled chaos, usually caused by Shaggy and Scooby. In Scoobynatural, a nod is made to this running gag when Dean Winchester comments that "Fred's traps never work" after one fails despite Dean earlier telling Fred that making traps is what he does best.
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At the request of Dean Winchester, Fred develops a trap for the ghost by salting all the windows and doors into the room except one which an iron chain is strung across. Above the door, is hung a net of coconuts which will be released when the ghost hits the chain, causing an axe to drop the coconuts on the ghost, making it fall into a slide leading into a washing machine that can be secured with iron chains, effectively trapping the ghost. However, when the trap is sprung, Scooby, Shaggy and Castiel slip on the coconuts instead which pass through the ghost harmlessly, sending the three into the washing machine instead of the ghost.
After the failure of Plan A, Dean Winchester, commenting that "Fred's traps never work," implements Plan B: Operation Bookworm. In this plan, the gang all run out through different doors, ultimately leading the ghost, who follows Daphne, into the library where the ghost finds Fred, Daphne and Velma hiding behind a couch. Scooby then throws books through the ghost, egged on by Shaggy. When the ghost gets close to Scooby, he hands the ghost a stack of books and uses his tail to pull a book acting as a lever controlling a trapdoor beneath the ghost. The ghost falls down the trapdoor and through a series of slides to a lower level where a salt circle has been laid out. Unable to cross the salt, the ghost is left trapped and forced to explain itself.