Logic of an (almost) four year old

S: why did you speed up then?
Me: to overtake the bus.
S: why?
Me: because it had stopped.
S: why?
Me: maybe to let someone off or on.
S: (pause) Why did you overtake it?
Me: because I couldn't go through it.
S: why not?
Me: because it's made of metal and metal doesn't go through metal.
S: why not?
Me: I'm pretty tired. (Mid migraine) Why don't you have a think and see if you know the answer.
S: (long pause) because they're not ghosts...?
Me: absolutely right. They're not ghosts. They're solid, not gas.

You can teach science anytime! 😍