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Candace, suffering from schizophrenia, dies
Then Linda reads her diary and asks Walt Disney to create a program in memory of her.
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Phineas got bullied a lot in school and killed, so Candace, unable to handle
Phineas got bullied a lot in school and killed, so Candace, unable to handle his death, built an imaginary world where he still exists.
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Phineas and Ferb are a figment of Candace's imagination.
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Ferb has crippling mental issues.
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Dr. Doofenshmirtz is Candace's psychologist.
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Doofenshmirtz is Phineas from the future.
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Pinhead Pierre is Phineas's father.
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Doofenshmirtz is Phineas's father
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Candace is the true villain.
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Perry the Platypus and Agent P are two different entities.
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The mom knew it all
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Perry the Platypus is Candace and Phineas's father
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Darth Vader is Phineas and Candace's father
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Norm the Robot is Phineas's father
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Doofenshmirtz works for O.W.C.A.
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Candace created Phineas and Ferb
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Linda was married to Doofenshmirtz
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Charlene Doofenshmirtz is Phineas and Candace's mother and lives a double life
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Charlene Doofenshmirtz is Ferb's mother
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Ferb isn't English but French
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Phineas is Vanessa's brother
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Thaddeus, Thor, and Mandy are the cousins of the Flynn-Fletchers
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Buford hates Baljeet
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Heinz Doofenshmirtz is Ferb's mother
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Ferb is part or fully alien
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Phineas's father is Bill Cipher
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Candace was abused by her birth father
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Phineas and Candace's dad is Roger Doofenshmirtz
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Ferb is responsible for Phineas's dad's death
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Phineas's father is Marty the Rabbit Boy
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Phineas and Ferb built Epcot
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Phineas and Ferb are reincarnations of Doofenshmirtz and Perry the Platypus
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Phineas is secretly a nightmare fetishist