Suggestions by @batboy1999

Marlon Wayans

as Kit Ramsey/Jiffrenson "Jiff" Ramsey in Bowfinger (2009)

Jamie Foxx

as Kit Ramsey/Jiffrenson "Jiff" Ramsey in Bowfinger (2009)

Jim Carrey

as Robert "Bobby" K. Bowfinger in Bowfinger (2009)

Bill Murray

as Robert "Bobby" K. Bowfinger in Bowfinger (2009)

Robin Williams

as Robert "Bobby" K. Bowfinger in Bowfinger (2009)

John Landis

as Director in Ace Ventura: Pet Detective (1984)

Randy Quaid

as Champion "Champ" Kind in Anchorman: The Legend of Ron Burgundy (1994)

Dan Aykroyd

as Brain in Anchorman 2: The Legend Continues (1998)

Martin Short

as Edward Nygma in Batman Forever (1985)

Steve Martin

as Ace Ventura in Ace Ventura: Pet Detective (1984)

Martin Short

as Ace Ventura in Ace Ventura: Pet Detective (1984)

Jim Henson

as Earl Stutz in The Iron Giant (1989)

R. Lee Ermey

as General Shannon Rogard in The Iron Giant (1989)

Michael McKean

as Kent Mansley in The Iron Giant (1989)

Phyllis Diller

as Karen Tensedge in The Iron Giant (1989)

Wilford Brimley

as Foreman Marv Loach in The Iron Giant (1989)

Frank Welker

as the Iron Giant in The Iron Giant (1989)

Frank Oz

as the Iron Giant in The Iron Giant (1989)

John Stamos

as Dean McCoppin in The Iron Giant (1989)

Karen Allen

as Annie Hughes in The Iron Giant (1989)