Waiting for a lift down to the car park in John Lewis. First and second were crammed full so I waited for the third. A young woman next to me asked if I knew where the lifts were that went up. 

 I explained that they all did but she seemed unconvinced.  

 rubschin:I pointed out that one way lifts would only ever make one trip. She appeared to think hard about this. 

 We eventually got into a down lift and at the car park level I showed her how to press the button for the second floor. She was full of gratitude!!!