World's Greatest Dad is a 2009 American black-comedy drama film written and directed by Bobcat Goldthwait and starring Robin Williams, Daryl Sabara and Alexie Gilmore.

Lance Clayton is a single father and high school English teacher who dreams of becoming a famous writer, but his previous novels have all been rejected by publishers.

While giving a speech, Lance decides that he can no longer continue the charade and confesses to everyone that Kyle's death was accidental, and that he wrote the suicide note and journal.

The critical consensus reads: "World's Greatest Dad is a risky, deadpan, dark comedy that effectively explores the nature of posthumous cults of celebrity.

Mankiewicz saluted Daryl Sabara's performance as exceptionally well done, commented on the film's "remarkably funny script", and overall considered it a "little gem".

[citation needed] Roger Ebert of the Chicago Sun-Times gave World's Greatest Dad three stars out of four, but noticed that the material could have been even darker in its satire, and he questioned whether it was the director's intention.

[8] The movie was released on DVD on December 8, 2009, and features an audio commentary by the director, as well as deleted scenes, outtakes and a "making-of" featurette.