Neighbours child entered our backyard looking for his drone. He found it and upon leaving tripped over a wobbly slab in our garden. Scuffed his knee and broke his drone. Very sad for child.
His father has just been at the door saying it was our responsibility to replace the drone as we had a wobbly slab in our garden which is dangerous 
I explained that actually his child had entered our garden without permission, and accidents do happen. He said we weren’t home, to which I replied that they should have waited - we were out for 20 minutes.
Anyway, neighbour gets angry and says if we don’t replace it he’s going to sue, I told him he’d been watching too much American TV and shut the door.
Now I’m not stupid. I know I’m not unreasonable or responsible for the drone my question is how can he think I am?! Does he really, or is he just trying his luck?