John Wayne Gacy, Jr. (March 17, 1942 May 10, 1994) was an American serial killer and rapist, also known as the Killer Clown, who was convicted of the sexual assault and murder of a minimum of 33 teenage boys and young men in a series of killings committed between 1972 and 1978 in Chicago, Illinois.
At the age of 9, Gacy was molested by a family friend, a contractor who would take Gacy for rides in his truck, then fondle him.
http://en.wikipedia.org/wiki/John_Wayne_Gacy
Although an extreme case of sexual perversion, it's sad society refuses to see the correlation between pedophilia, homosexuality and insanity.