"Cameos are "parts" for which the actor or actress is not usually listed in the credits and the on-screen time is short.
Charlton Heston in Tim Burton's "The Planet of the Apes"
Mel Gibson in "Father's Day"
Robin Williams in "Dead Again" (his role was a surprise)
Danny Glover in "Maverick" (someone mentioned this)
Gene Hackman in "Young Frankenstein" (someone mentioned this)
Bob Hope and Bing Crosby in "The Greatest Show On Earth" (someone mentioned but had incorrect movie title)"