Sven Golly, born Svenjamin Golly, was a hypnotist at the circus. He hypnotized Homer into thinking he was 12 years old in The Blunder Years and makes him think that he is 10 years old in Bart's New Friend. He asks Marge where she was while he was still straight because she is so understanding and accepting of Homer's faults. Sven was arrested and jailed but escaped by tricking Chief Wiggum into thinking that they switched identities.
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Behind the Laughter[]
Sven Golly's name is a reference to Svengali, a fictional character in George du Maurier's 1895 novel Trilby. The word svengali refers to a person who, with evil intent, dominates, manipulates and controls a person.