First of all, let me start off by saying this is not a joke, this is a genuine sighting report.

It was half past two in the morning and it was completely silent. I was in the bathroom cleaning my teeth, getting ready for bed, when suddenly I heard the letterbox lift up and violently slam as though someone had purposely done this to get my attention. 

Usually, when it is very windy the letterbox will bang and clutter, but never this loud. Besides, it was completely calm outside with no wind at all, so I found it rather strange and quite perplexing that it had slammed like that. I quickly finished off and rinsed my mouth, placed my toothbrush down on the side, and then quickly went downstairs to look out the hallway window and see if there was anyone outside mucking around at this ungodly hour of the morning.