Bike Outside

When I was a child there was a brief fashion for jokes that made no sense. Jokes whose punchlines were non sequiturs. For example:

A guy goes into a shop and asks for a tin of red paint. The shopkeeper says ‘I’m sorry, we’ve only got blue’. And the guy says ‘That’s all right. I’ve my bike outside’.

I remember telling a friend this joke, and his reaction was mystification, followed, eventually, by helpless laughter.