My upstairs neighbours let their (nearly 2yo i think?!?) play on the balcony unsupervised. Every now and then the mum will shout "x noooo...nooo...NO!" But not actually do anything else. He throws balls,clothes,dummies,sand(my balcony is full of it) and anything else he can get his hands on in my garden. I normally just throw/give it back and didn't want to make too much fuss. Today i was on the balcony having a fag,feet on the rail when water started falling down and got my feet wet.Again the mum was just nooo..nooo. I got up and looked....he was bloody peeing!! On my feet!! I went totally mad and told her to watch her kid properly and that from now on,all the shit that's theirs in my garden goes straight in the bin. AIBU.