One morning, I had just woken up and was still half asleep when I heard a knock on the door outside my bedroom. I didn't think much of it at the time and assumed it was Peem, so I replied, "Come in."

The strange part was that Peem wasn't the one knocking. In fact, no one had knocked on the door at all.

I have to admit, it felt a little creepy. The sound had been quite clear and loud—it was unmistakably the sound of someone knocking on a door. Yet when I checked, there was no one there.