I have lived in the same house in London for all my life, just a small little 3 bedroom house... Really normal looking, really normal neighbourhood, normal family but sometimes in my home strange things happen...
One night in mid-March it was about 3:30am when I heard the fire alarm go off, I woke up thinking it was my older sister coming home from a night out and then cooking food but had passed out on the sofa or something, so I got out of bed but realized that there was no smoke and all the lights were out... I went to my sister's room and she was in bed fast asleep.
My mum and her partner came out of their room and looked up at the fire alarm strangely then my mum spoke. "Maybe the batteries are dying. That's what happens" so I just shrug the whole thing off and went back to sleep whilst my mum and her partner took the fire alarm down and took the batteries out for the night.
For some reason the next morning my mum's partner was putting the old battery back into the fire alarm. "Thought mum said that it was dying?" I questioned and he just carried on putting it back together. When he put it back up later that day he tested it and made sure that it was working and then he remembered that the battery was only a couple of months old so it wouldn't be drained... I personally thought that was a bit weird but again I just shrugged it off.
A few weeks later I was walking up the stairs when I saw a white mist go into the fire alarm and it started going off again. The weirdest thing was that I was home alone; I wasn't cooking anything so I knew it wasn't smoke and it was just the small little piece of white mist, I told my mum when she got home.
Since then I haven't seen the mist and the fire alarm hasn't gone off... It was just those two times. It is something I will remember for the rest of my life.