michael001: Not sure what you should do, but I can tell you what a vindictive a-hole would do.

I have a friend who goes to bed early and wakes at 3:30am every day and plays games until dawn. Weekdays, weekends - it matters not - he sits in his man cave which sits hard up against a shared walkway. The person in unit 4 had a habit of coming home at 5am and throwing various fast food wrappers, bags and scraps in his bin. He didn't care all that much until the same neighbor chased his cat with a water pistol one day so he 'dog pooed' the underside handle of his wheelie bin lid - right where your fingers sink into to lift the lid.

Sure it was a little annoying to clean the bin with the hose, but he can still hear the sweet memories of her wailing, crying and dry heaving outside his man cave window. One can only imagine that she somehow got it all over her face. Whatever the case, she never put rubbish in the bin again which was a shame, because he genuinely didn't care. He loved that cat though.