The roll call so far includes Demi Moore, Madonna, Gene Wilder, Sir Elton John and Michael Douglas.

BBC: Cleese has made a string of recent film cameos

The film, expected in theaters in July and starring Ryan Reynolds (Van Wilder, Green Lantern), Paul Giamatti (Sideways, John Adams) and Michael Pena (Gangster Squad, Tower Heist), depicts a snail that, through some strange turn of events, manages to become capable of great speeds in the aftermath of a freak accident.

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