Prompt: A prankster sets up a trap for his unsuspecting friend. He writes \"prompt\" on a cardboard box and places it on the floor. He props up one end of the box with a wooden stick and hides a foam rubber thumbs up under the box. He hopes that his friend will be curious enough to pull the stick and trigger the trap. He crouches behind a sofa across the room, with a snickering expression on his face. He waits for his friend to enter the room and fall for his prank.