These old Fiats are ubiquitous in Amsterdam. I wanted to take the most charming car and violate it! Some ridiculous/mysterious force has thrust the pins into one side of the car. The pins breathe in and out with a slight twisting motion.
As you come close to the car, the pins bang in and out violently and shake the whole car. I can also pull the pins completely inside the car and have them thrust out suddenly when someone is near.
People jump back and a startled sound jumps out of their mouths. I wanted THE BIG BANG THEORY to be a "fuck you piece." But in the end it's too funny to be really menacing.