Homer: Principal Skinner, Allow Me To Introduce You To My Wife's Lovely (and Available) Sister, Selma.

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Homer: Principal Skinner, allow me to introduce you to my wife's
lovely (and available) sister, Selma.
Patty: You bozo, I'm Patty!
Homer: What!?
Skinner: [dreamily] Patty...
Homer: D'oh!! Wrong one!
-- Homer introduces Principal Skinner to the wrong
woman, "Principal Charming"