Don't Give Up the Sheep is a 1953 Warner Bros. Looney Tunes cartoon directed by Chuck Jones.
Ralph's tries to trick Sam into going home early, by turning the time on the punch clock forward and setting the whistle off.
Sam is initially tricked into thinking that the whistle indicated lunch and then quitting time, punches out, and heads home.
Ralph then gives up and carries the sheep back to the field as Sam impatiently taps his foot (disguised as a tree root).
Ralph reads a book of Greek myths which explains that Pan would "lull shepherds to sleep with the music of his pipes and then steal the sheep."
The cartoon then disobeys gravity and leaves Sam's piece of earth floating in the air, as the rest of the cliff which Ralph is standing on falls down.
Sam hits him over the head with a club, and the viewers see that George is really Ralph in a flawless disguise (complete with latex mask).
Additional featured music includes Gioachino Rossini's William Tell Overture and Felix Mendelssohn's Spring Song (the latter is played on flute by Ralph Wolf while he is disguised as Pan).