Scooter complains that he has a hole in the knee of his pyjamas which is annoying him. I wave him away somewhat impatiently suggesting that he find more pressing matters to think about with and obediently, he disappears upstairs.
A short while later, he returns with the news that he has solved the problem of the hold in the knee of his pyjamas and is thus able to resume playing. I look down and sure enough, there is no longer a hole, but one trouser leg is now distinctly shorter than the other.