Today I'm going to home in on how to use Eddie's dim-witted, "Are you serious, Clark?" line. Observe:
In this NLCV scene, the adults are in Group 1, led by Clark, whose purpose is to up the Christmas-cheer ante by making the kids, Group 2, believe that Santa was en route. Eddie, the plastic-skulled slow-coach, ruined the illusion with his idiotic, "Are you serious, Clark?"
This classic can be applied to any situation in which there are two groups present: 1) People who are in on the joke/hoax/fib and 2) People who are fleeced by the joke/hoax/fib. When someone from Group 1 doesn't cotton on and unexpectedly joins Group 2, a well-placed, "Are you serious, Clark?" will do the trick nicely.
Real Life Application
Tonight, my parents babysat Ethan while Noah and I had dinner with friends. When we picked him up, he was so wired that he performed a wild dance while thanking God for our tomatoes, then he knocked off everything from atop of the coffee table in a single violent sweep. Naturally, I didn't want him to know Kyle was coming over to do P90X with me—Uncle Kyle coming over would be the perfect excuse to fight the onset of some much-needed sleep. So we staged a hoax: Uncle Kyle would come out to the car and kiss Ethan goodnight, then follow a few minutes later.
"I THOUGHT KYLE WAS GOING TO YOUR HOUSE," my mother said loudly. While everyone else shouted their reproaches, I knew exactly what needed to be said.
"Are you serious, Clark?"