My first tennent tried to kill his partner with a samari sword. I knew nothing about it until they stopped paying rent as he had been arrested by armed police who swarmed the house.
They trashed the house when I evicted them for non payment of rent but thankfully went. Then we found out they hadn't paid the council tax or Bill's for the entire length of their rental.
They moved on with no issue to another rental with no references. I had 150 fag burns in their bedroom carpet.
Thank fuck I have never had anyone bad since but OMG did that open my eyes! The mum had two young kids and took him back. Poor bloody kids.
I have been more guarded since as I dont want to appear like a walk over. The next tennants are still there after a decade but even they started paying rent a few days late, then weeks, then a month late. I just served them a section 21 after the second attempt to get them to set up a dd.
Then I had to go to their house to explain I cant pay the mortgage if they dont pay the rent. They are old enough to be my parents. It was truly cringe that they seemed to have no idea how to adult in their sixties. But they overall they are great. It didnt make me wonder how you can get the a fully grown adult and think it's fine to tell your landlord about your multiple cruises every year and not priorities the roof over your head.
But on balance the tennants have been good, I just had the psycho nutter from hell. I think they just went from house to house taking the piss so how they passed letting agent checks, I cant imagine