Clark: Hey, Kids, I heard on the news that an airline pilot spotted Santa's sleigh on it's way in from New York City. [the kids sit up excitedly]
Eddie: [after a pause] You serious, Clark?
Eddie: [after a pause] You serious, Clark?
Clark : Hey, Kids, I heard on the news that an airline pilot spotted Santa's sleigh on it's way in from New York City. [ the kids sit up excitedly ]
Eddie : [ after a pause ] You serious, Clark?
http://www.moviequotedb.com/movies/national-lampoons-christmas-vacation/quote_35359.html