Homer: Why Am I Such A Loser? Why? Bart: Well, Your Father Was A Loser, And _his_ Father, And His Father.

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Homer: Why am I such a loser? Why?
Bart: Well, your father was a loser, and _his_ father, and his
father...it's genetic, man. [realizes] D'oh!
-- That's not the only genetic thing, either,
"Homer Loves Flanders"