“Are you serious, Clark?” is a famous quote from the classic Christmas movie “National Lampoon’s Christmas Vacation” (1989). The line is delivered by the character Russ Griswold, played by Johnny Galecki, to his father Clark Griswold, played by Chevy Chase.
In the movie, the Griswold family goes through a series of comedic and chaotic events as they try to celebrate Christmas. This particular line has become iconic and is often quoted by fans of the film. It’s a humorous way of expressing disbelief or surprise at something someone has said or done.