Throw in some obstacles- the back/side gate being locked. A load of wheely bins in the way. A bbq full of rain water that needs to be moved and soaks your leg. A small, yapping dog running round your feet and the customer insisting 'he only wants to say hello'. Or the customer asking 'do you want to have a look at my new fitted kitchen?' or telling you about her son's promotion at work or the hip replacement she recently had.