MOMMY, WHY DID YOU STOP?
Because there was a stop sign.
WHY DID YOU GO?
Well, did you see that red light flashing?
Well, that meant that I had to stop, and as soon as there were no cars coming from the other directions, I could go.
WHY THAT RED LIGHT FLASHING?
It's to let you know there is a stop sign there.
Because the people who built the road put it there to make sure all the drivers know what to do.
So that we don't crash into each other.
So that we don't get hurt and damage our cars.
[Giving up] It's the laws of physics.
MOMMY, WHY YOU LAUGHING?