I got into the lift with two men from my office floor. The lift went down a level and two other men got in. Looking idly around, I noticed with a start that all four men were wearing pink shirts.

‘Gee!’ I thought. ‘This fashion for pink shirts really has become a permanent fixture.’

As the lift neared the ground floor, I was mollified when I figured out that one of the men was actually wearing a white shirt. It had only looked pink because of the pink light being reflected off our colleagues.