Grampa relieves his Air Force days on The Simpsons. "Let's Go Fly a Coot" is the 20th episode of the shows 26th season.
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Homer finds out he must stay sober to keep his postion as Duffman's replacement on The Simpsons. "Waiting for Duffman" is the 17th episode of the show's 26th season.
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Famous Inventor Elon Musk guest stars on The Simpsons. "The Musk Who Fell to Earth" is the 12th episode of the show's 26th season.
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Homer is hypnotized while at the circus on The Simpsons. "Bart's New Friend" is the 11th episode of the show's 26th season.
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The Simpsons get on the wrong amusement park ride and end up on Kang and Kodos' home planet in "The Man Who Came to Be Dinner"
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Marge tells Homer not to bother coming home for Christmas. "I Won't Be Home For Christmas" is the ninth episode of the show's 26th season.
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Homer starts his own cover band and Sammy Haggar guest stars on The Simpsons, "Covercraft"
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The Planet Express crew arrives in Springfield on a The Simpsons / Futurama crossover episode.
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The Simpsons Quotes

Lisa's Brain: Poor predictable Bart. Always takes 'rock'.
Bart's Brain: Good ol' 'rock'. Nuthin' beats that!
Bart: Rock!
Lisa: Paper.
Bart: D'oh!

Homer: You're welcome to watch anything you want on TV.
Bart: TV Sucks.
Homer: I know you're upset right now so I'll pretend you didn't say that!