Mine isn't as good as many but was inspired when I read some on the same thread as the mexican house thief is on.
Years ago I went to uni and my best friend and I got a flat together. It was our home and not just a room with some shared space. Unfortunately my friend got a boyfriend at Christmas after our first term who lived in our home town which was an hours commute. After Easter she didn't return as she found a neighbour drive in every day. She had paid rent for the year but left me with the bills to cover alone.
So this is how I came to meet my cf. I put an advert out looking for a flatmate. I was up front about wanting a flatmate I could get on with and that this was a shared home etc. One of the rules I had was no smoking in the flat, I hated it and didn't want the flat to stink. CF agreed, she didn't smoke etc. As friend had moved out I agreed she could live rent free for the rest of term and just pay half bills.
After moving in she tried to bring her dog which was specifically against our tenancy and she knew this. Apparently her mum refused to keep the dog so it was my fault she had to have him pts.
She would regularly go missing - not an issue but have to admit the first time I got worried. She left on Saturday with her boyfriend to go shopping and said she would see me later. He mum rang on Tuesday and to speak to her and I said I hadn't seen her since Saturday and didn't know where she was (I have to admit as a 19 year old living alone it had been worrying me that I should report her missing). Anyway, her mum rang me back and said she had tracked her down to her boyfriends. When she came home she wasn't happy as her mum had told her off for being so selfish etc.
She had lots of mates around which of course was fine but they were smoking in her room (she thought I wouldn't know) plus I never knew who was in the house. I was sat in the living room in my pjs once, had been home hours and out walks some strange lad to go to the toilet.
I decided it wasn't working so asked her to find somewhere else to live. It turns out she was and was moving out the following week!
This is where she became a cf. She moved out taking a pan, half the (matching, didn't even take the off stuff my GF gave me but the matching set me and prev FM bought!) crockery, food plus other bits and bobs and ran up a huge phone bill (her new flat mate was german so she had been ringing her to arrange the new flat.
Multiple calls to her I eventually rang her mum and said I needed the phone bill paying and I wanted my stuff returned. A couple of days later a kid came to the door (her little brother) and thrust a pan at me and ran off. Inside the pan was money, cutlery and some sweaty cheese 😂