Not saying I enjoy it. Not saying that I’d drive a giant banana either. But if I saw a police car, pull over a giant banana, I would think it was hilarious. That’s the definition of whimsy.
Being pulled over is a command under threat of violence, by an agent of the state empowered to use deadly force, who is mostly insulated from the consequences of poor judgement or abuses of power. Being pulled over by cops cannot be whimsical.