Absolutely unexpectedly, they found out that the son at the age of three learned to open the lock at the front door. The husband held an explanatory conversation about not opening the door to strangers, etc. A few days later we play, he closes in the room, I knock.Son from the door:Who is there?
I am: open it up! The police.
I have no acquaintances in the police. The stranger told me not to open.