We have people dump rubbish in our bins sometimes because we're diligent enough to put them out the night before collection rather than rushing out at the last minute as the rubbish truck trundling down the street. Ours neighbours over the road recently had one of their adult sons move back in with the parents after busting up with his wife, and all his stuff came with him. What do you know, my mother goes out to put a small kitchen bin bag out in the wheelie bin and finds a huge black rubbish bag (obviously not ours, we use white ones) full of stuff that really should go in the recycling bins that's collected every fortnight. It's so obvious it's come from over there.
I'm not greenie, but people chucking their rubbish in someone else's bin / on the ground / not recycling basic things really annoys me. The council rubbish truck also has a habit of tipping bins over onto the roads. Thankfully, our street, house over the road (again!) excepted, is pretty quiet traffic-wise, or it'd be a much greater hazard.