You and your friends walk up to the front door. The three of you knock and shout: "Trick or treat!" But there is no answer. Richard rings the doorbell, and the light in the house goes out. Nicole crosses her arms. "Some people are no fun." An evil grin grows on Richard's face. "We should play a trick on them." What do you think? Yes, let's play a trick on them. No, let's get out of here.