Car conversation:

Kid: I just saw a photon.

Me: A what?

Kid: A photon.

Me: What? A photon? How?

Kid: On top of a car.

Me: I do not understand. How did you see a photon?

Kid: Strapped to the top of the car.

Me: [Pause] Do you mean... a futon?

Kid: Yeah. Futon. Photon. Same thing.