Looney Tunes: Back in Action is a 2003 comedy adventure that combines live-action with animation. The movie stars Brendan Fraser, Jenna Elfman, Steve Martin, Bugs Bunny, Daffy Duck, and a host of other Looney Tunes characters. The movie was directed by Joe Dante, with the animation supervised by Eric Goldberg.
In the WB cafeteria, a cartoon Scooby-Doo (voiced by Frank Welker) and Shaggy Rogers from Hanna-Barbera's Scooby-Doo, Where Are You! series (Shaggy appropriately voiced by Casey Kasem, respectively), argue with Matthew Lillard, who plays Shaggy in two live-action movies, about Lillard's movie performance (Shaggy threatens to come after Lillard if he performs similarly in Scooby Doo 2: Monsters Unleashed).