Not really strange but unexplainable.
My mum had a shop in Keighley for a few years next to my school. I had to spend every fucking day there from 3pm to 5pm until she shut.
One day my mate comes with me and my mum sends us upstairs into a flat that was empty. It was very weird above the shop. It had a side entrance or you could just go through a sliding door at the back of the shop. Not very secure.
Anyway we go walking up the first flight of stairs, fart about for a bit and then I walk up to the top floor which was like an attic. There was an old knackered bathroom and in the bath was a black bin liner full of old newspapers on fire. Probably been going for 30 seconds.
My Mum came up and put it out, called the fire brigade and we got interrogated.
I swear to god it wasn’t me or my mate.
The whole building would have gone up in flames.