When people leave their shopping carts in the aisles of supermarkets ...and nobody can get by them as they are blocking the whole aisle. Also when supermarket staff, especially males, stand around in the aisles chatting and having empty cardboard boxes everywhere blocking the aisle. I also do not enjoy them staring at each and every female shopper.
Small children running around unattended,this is dangerous, as they do not seem to be able to see when somebody with a full shopping cart comes and may not be able to stop for those small children.