We are in the middle of moving house. We have loads of accumulated crap, mostly in the garage, so we have hired a skip to get rid of it.
The skip is directly outside the house (we don't have front gardens, the front doors open onto the street) and has been there since Tuesday. Since then, our next-door neighbours have been chucking their rubbish into it. The skip is about 20 yards from their wheely bin. There is probably about a quarter of the skip now full of their shit empty beer cans and stuff.
The skip cost us £180 to hire. AIBU to want to knock on their door and ask for £45 to cover the cost of the bit they've filled.
(I do know this is an occupational hazard of having a skip, and I wouldn't have minded if they'd just asked!)