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Unidentified Flying Outrage! is a book which Bart bought at Books! Books! And Additional Books!. The ideas in the book played a major role in a conspiracy-theory investigation by the kids of Springfield to explain suddenly-appearing suspicious behavior they saw among the town's adults.

Bart became interested in UFO when he thought he saw one outside his bedroom window and asked his parents to investigate (interrupting them in the middle of a romantic encounter). Marge found that the "UFO" was an old golf umbrella stuck in a tree, but Bart still wasn't convinced. He asked to sleep with his parents, to which Marge quickly said "no". In her eagerness to get back to Homer, however, Marge agreed that Bart could sit on the roof with a baseball bat in case a UFO did come.

The next day, the family went on a book-shopping trip to Books! Books! And Additional Books!, and Bart bought a copy of Unidentified Flying Outrage!. He started reading the book and quickly became interested in conspiracy theories involving UFOs. His interest was fueled by the suddenly-appearing behavior among the town's adults of rushing home and immediately going indoors (which was actually due to the introduction of Simpson & Son Revitalizing Tonic). Bart and the neighborhood kids, however, knowing nothing of the tonic, developed an elaborate theory involving the RAND Corporation, the "saucer people" and "reverse vampires" to explain the adults' behavior.

The outcome of the kids' investigation isn't known. Presumably it dissolved after Bart finished reading Unidentified Flying Outrage! and after Simpson & Son Revitalizing Tonic's initial wave of popularity died down.