Bart and Lisa discover that Mr. Burns is actually a vampire in "Treehouse of Horror IV."
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A picture of a young Monty Burns and his beloved teddy bear, Mr. Bobo.
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Homer ends up going back to college to complete his degree and gets tutored by a group of nerds, who he tutors in partying.
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Moe flies to Los Angeles where he joins the cast of American Idol judges on The Simpsons season finale.
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Sideshow Bob returns to The Simpsons to try once again to kill Bart. This time he does it with someone else's face.
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The Simpsons wish you a Happy Mothers Day with their special episode on Sunday.
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Queen Elizabeth (guest voice Eddie Izzard) makes an appearance on The Simpsons with her son Prince Charles.
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Lisa becomes attached to a beached whale, which she nicknames Bluella.
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The Simpsons Quotes

Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Homer: D'oh!

Mayor Quimby: And, uh, may the Force be with you.
Leonard Nimoy: You have no idea who I am, do you?
Mayor Quimby: Sure, I do. You're one of the Little Rascals, right?