[Reaganesque]

There's quite a few to choose from but I would have to mention:

Billy Crystal and Carol Kane in "The Princess Bride"
Bye, bye boys! Have fun storming the castle!

Marcel Marceau (famous French mime) in Mel Brook's movie "Silent Movie." The movie is totally silent but for Marceau's response to Mel Brook's character's invitation to be in his new movie: "No."

[MarkL]

One of the saddest cameos was seeing the Three Stooges in "It's a mad, mad, mad, mad World." It was sad seeing how old they had gotten...

Mark

[TomSmedley]

Jesus, in the history of the world.

To see why our Lord chose the cameo route, see the John Candy movie Delerious for a hilarious counter-example. Candy plays a soap-opera writer who wakes up inside his creation after a blow to the head, WITH the magic typewriter that allows him to re-write the script from inside! As he flaunts his powers, his creations have their characters warped, and find themselves inexplicably acting out of character. Whereas the Lord of Glory clothes Himself in frail humanity, so that unbelievers have the luxury of continuing in unbelief, if that's what they really want. And in the end, no one will have grounds for complaint.

[SlowBoat407]

Has anyone mentioned the screen in "Men in Black" showing all the famous people who are really aliens? I don't know if these were true cameos, or just footage ganked from other sources, but I still freeze that scene to look at all the folks.

[SaveTheChief]

Okay. This isn't the best movie in the world, but certainly entertaining, and has good performances by all the kids...

Dave Foley was very funny as All American Boy in the movie "Sky High"

And although she certainly didn't steal the show, Lynda Carter as the principal was a nice casting touch.