Child endangerment

My husband was home on Monday, so we took the chance to run some errands together. He put Pontus in the car and we got on our way.
We had barely made it to the main road when my husband suddenly stepped on the brakes, turned off the engine and jumped out of the car. And in that same second I realized where the very refreshing draft I had been feeling had come from: we had driven off with the car door on Pontus' side being wide open. WIDE open.

I know that my husband has the memory span of a goldfish (he has proven that more than once), but this has to be his masterpiece.