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The Jumbaco is a fictitious menu item at Jack in the Box that consisted of a Jumbo Jack burger sandwiched between two tacos. In one of the chain's commercials, Jack is showing one of the representatives of Jack in the Box the Jumbaco with a commercial rough cut, but the idea is turned down, as research shows that customers preferred the "Jumbo deal" (A Jumbo Jack burger, two tacos, fries, and a drink). It is revealed at the end of the commercial that it was actually Jack's son, Jack, Jr., who came up with the idea, and is dismayed that his idea was turned down.

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