The Grim Adventures of the Kids Next Door Easter Egg - Fosters Home of Imaginary Saying

In the special episode of The Kids Next door (The Grim Adventures of the Kids Next Door) when many is torturing Number 1 in the beginning, Fred Fred burger in the TV says he likes "imaginary friends." This is a reference to the tv show, Fosters Home for Imaginary Friends, and there are also apearances in Fosters that include Grim Adventure characters.