I find the best laugh is when I slip the "silent deadly" in the car on the wife. The key to this whole maneuver is to slowly, paying close attention that you are not spotted, reach over and snap the window locks to the locked setting. Twist the heat knob to the highest so that you get a good warmth in the car. Then, like you were old Saint Nick, start to whistle a tune as you wait for the cursing to start.