Alert regular “Sitting Duck” suggests:

My topic suggestion concerns tack-on riffs. By this I mean riffs where the riffer adds on something to what a person in the movie just said. For example, my favorite occurs in the “A Day at the Fair” short, from Code Name: Diamond Head. During the cake judging, the narrator states, “Judging cakes ought to be fun.” Servo then adds, “…but this woman sucks the joy out of it.”

This works especially well with narration. The first one that comes to mind is from “A Date with Your Family.” Narrator: “The women of this family seem to feel they owe it to the men of the family to look relaxed, rested and attractive at dinner time.” Mike: “…so they’re unsuspecting when they KILL THEM!”

What’s your pick?

Keep those topics coming!