I hate it when you are in KFC and there is only one person serving and you need to queue but there are 2 people doing the drive-in queue. Once I stood in a queue for 2 mins, saw it wasn't moving and went out, got in the car and was served in the drive through before the shop queue had moved at all.
Also in the chinese carry out when you are queueing up and the phone keeps going and the phone people's order is always taken whilst you are standing waiting, they take precedence over you. Although The Rupee Room in Ayr don't do this - they ask the person in the phone to wait