People who walk slowly, and subsequently 88% of the members of the Facebook group 'I secretly want to punch slow walking people in the back of the head. Why? Because everyone walks f**king slower than me. If I'm going through a shopping centre, I shouldn't have to jam on the brakes to stop behind you as you stop to fiddle with your bags or answer your phone. If you have a small child and thus a pram, put the f**king kid in the pram and push it yourself. Don't let them push something designed for an adult to push which they should be in, what results is I have no idea which way they are going to go next and stop like a rabbit in headlights. Creating the afore mentioned, stopping in the middle of a path, er, syndrome.