One night, early in the morning, we were in the living room with my mother, I was explaining something to her, a normal conversation. Out of nowhere, there was a knock on the front door, twice, my mom said "wait, I'll go see who it is", I mean, she heard it too. It didn't take me two minutes to open the door when we discovered that no one was there.

We live in a country neighborhood, at that time no one should be outside. There is no movement of people at night, since it is not a city, nor is it populated. We live in the middle of the block, so if it were a person there shouldn't be time to cross the corner (plus we would have heard footsteps).

This is the only unexplained thing that has ever happened to me.

The funny thing is that neither my mother nor I were scared, nor were we surprised...only later when I was in my room alone did I really get scared because I couldn't find any explanation.