Wow to all of these! Hard to believe these cheeky fuckers actually exist and could possibly have any sort of friendships with anyone!
When I moved in with my bf (now h), his ndn had a key, as he did for hers - they both fed each other's cat (cats in her case as she was a crazy cat lady) if they were away. All well and good. Bf even let her borrow videos occasionally if there was a film she wanted to watch. Then I found out that this woman was randomly letting herself into the house and just taking stuff to borrow. I'd just moved in and brought a DVD player with me, and had a few dvds as all quite a new thing then. I found one day, not only had she helped herself to several of my DVD's, she had actually opened 3 brand new ones that I hadn't even watched yet! Then she got all uppity about the fact that she didn't even know we had a DVD player and thought it was just her with one?
She decided one day to put up that stuff on the fence that stops birds landing on there/keeps cats out. She said it was to keep her cats in.... except it was our fence she has done it to, damaged several parts of it and we had cats too that we were worried might accidentally get stuck in her garden. So we told her to remove it. She wasn't happy, but did it.
Same neighbour used to come round to our annual bbq. Only invited out of courtesy because she was a nightmare! She was one of these knit your own slippers type - everything had to be organic and vegetarian, used to pay to get "organic vegan water" delivered to her house as nothing else was good enough (someone saw her coming with that one!!). Anyway we would buy vegetarian food to cook etc. She'd bring a bottle of the most God-awful organic wine (according to everyone else it was awful, I don't drink wine).... but would she drink it? Oh no - quite happy to drink the quality and expensive bottles we bought for people or guests bought (I saw expensive but it probably wasn't - I begrudge spending money on wine). Then she'd get pissed and latch onto someone (me usually as I'm too nice) and start wailing on about how awful her life is etc etc.
She decided one day that a bush in our garden, nowhere near her garden, was too big - so got her dad to trim it... he hacked it and killed it. My hubby was not happy! She hadn't even mentioned that she had a problem with it so we never did find out why she wanted it cutting down.
On another occasion, her ex had moved back in with her. He's a story himself - Argentinian and a "debt enforcer"
- anyway no 'green card' because he had a criminal record and funnily enough the UK didn't really want people like him here. So he's moved in whilst on his temporary visa (he was also the father of her ds, affectionately known by everyone else as Hell Spawn). She decides one day to tell me all about how he had been diagnosed with hepatitis and how careful they have to be not to exchange any bodily fluids due to the risk and how hard it was to explain to her son he couldn't kiss his dad etc. Really didn't need or want to know this. Not a month later she announces that they're expecting another baby together?! So not quite sure how that happened.....
Then she had a miscarriage (very sad of course). Shortly afterwards, one of her cats was hit and killed by a car on the main road outside our houses (she was 2nd house down the walkway so not right on the road). She lost the plot! Started throwing paint all over the road, emptying her lawn mower etc into it too. Cars were getting paint splashed up all over their paintwork and understandably not happy. We weren't happy either as literally right outside our house and to get off our drive, we had to drive through it. Then she started op asking her car on that road instead of round the back where her garage/parking space was. No problem as plenty of space. Except she parked right to the very edge of our driveway and at a diagonal angle so that her car was sticking into the street, forcing cars to go off the road into a field entrance to her round it! Did us trying to get off the drive was awful because you literally couldn't see a thing with how she parked.
One day I was in the garden and heard her suddenly hurry out of the house and out the back gate. 5 mins later a police officer knocks at the door. He wanted to know if we'd seen the neighbour as he'd knocked, her son had answered (maybe 7 or 8 yes old) and had said she was home and went to fetch her but no-one came back then the door..... she had run off! Talking to the officer they'd had complaints about the damage to cars etc. He said that he understood that she'd lost a child (the implication being killed by a driver on that road) so we explained that she had had a miscarriage and it was the cat that died on the road. He suddenly looked rather 

There must be loads more about her - she was batshit crazy!
Looking forward to reading more tomorrow!