NCed for this as I've told a few people about these.
Once had the police at my door when I lived in a block of flats asking if I had seen one of the neighbours moving out because they'd apparently also taken the boiler and a lot of the copper piping with them.
Another time, same flat, I was downstairs in the block so people knocking on my window was common. This time it was two men in suits who wanted into the building, I popped out in my socks to open the security door for them and found broken glass all over the entry. When I told them to watch for the glass they told me that's why they were there, they were CID and there had been an attempted murder (I had apparently slept through all the noise.)
Last one was on Valentines this year. Not the same house as I've moved a couple of times since then. A flower delivery came to the door and DD answered it. The man said "flowers for [my name]" so she accepted them and brought them in. I read the card and was really confused as while it was addressed to my name, the number was my neighbour's (she'd heard the name and sent them to our door), and I didn't know anyone with the sender's name (only first names on it.)
After a couple of posts on social media in local groups to try to find them and a message to the florist we managed to trace the real recipient, she lived on our street but further up on the other side but was the even number in between mine and my neighbours (eg she was 24 and we were 23 and 25.)
I took them along to her myself and let the florist know I'd found her and taken the flowers to her. The next day the florist came to my door with a massive bouquet of flowers for me to say thanks for going to the trouble of finding her.