Funnily enough one of my previous properties had a nightmare neighbour.
He was utterly mad, old and his family up north. Semi detached house with his and lived in fear that one day he would burn down his house and take us with him by mistake- adult social care was poor in our area. Used to sit propped his sun lounger right out side his front door on the boundary line of our house and sit there drinking and knocking on the door saying that people had broke into my house and his and robbed us (never happened) and various other strange things vs .
He told a neighbour we running an underground cat selling business from our basement(we only have one cat who's a boy old and neutered and we didn't have a basement). Utterly utterly mad. Everyone knew he was bonkers and obviously unwell but it felt like one thing after another.
But when he called the police to say we had come home with a little girl that he had never seen before (who was my 3 year old dd who was born in that house and had met my neighbour several times) I was like this isn't normal he's very unwell and flagged everything to the police who I think spoke to his family and action was taken. Mainly due his mind rather than his body failing
He got moved to a home but periodically gets let out on day release and sees some of the other neighbours (with carer in tow), and sometimes asks how the kittens are doing 😅😅
At the time I was driven so demented I cried but now I can see the funny side. But god was it awful and took about 5 years to get sorted.
Oh the stories that man would tell, worst thing is no one warned me he was "unwell" so in the beginning I believed him.
I don't know how much of a happy story this is but hopefully gives you a chuckle op