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This is an incredibly annoying and effective booby trap. All you’ll need is string, nails, and flypaper from a home improvement store. Cut five feet of string and tie one end of the string to the doorknob. Now put two nails in the ceiling. Put the first one approximately a foot from the door and the other approximately five feet away. After you've done that, loop your string through the first nail and start attaching flypaper to the rest of the spring. Don’t wrap the flypaper around the string; just stick it on there so that there is plenty of sticky surface area still available. Loosely loop the end of the string around the final nail. When the door opens, the string will be pulled off of this last nail, the flypaper will swing down from the first nail, and stick to the person who opened the door.