I think IWBU but I was just so cross. On way home. Old lady with dog. Dog doing a poo which I presumed old lady knew because he stopped and squatted. When dog was finished lady walked on so I shouted- are you leaving that poo? Not aggressively, but not friendly either. She said she hadn't seen it and started looking for a bag. I think she probably would have just left it had I not shouted, but maybe she genuinely didn't know, as she was old and may not have the best eyesight. WIBU?