William Henry Jackson Griffith is an American cartoonist who signs his work Bill Griffith and Griffy. He is best known for his surreal daily comic strip Zippy. The catchphrase "Are we having fun yet?" is credited to Griffith.

Zippy the Pinhead is a fictional character who is the protagonist of Zippy, an American comic strip created by Bill Griffith. Zippy's most famous quotation, "Are we having fun yet?", appears in Bartlett's Familiar Quotations and became a catchphrase. He almost always wears a yellow muumuu/clown suit with large red polka dots, and puffy, white clown shoes. Although in name and appearance, Zippy is a microcephalic, he is distinctive not so much for his skull shape, or for any identifiable form of brain damage, but for his enthusiasm for philosophical non sequiturs, verbal free association, and pursuit of popular culture ephemera. His wholehearted devotion to random artifacts satirizes the excesses of consumerism.