A couple is waked at 3 o'clock in the morning by a knock on the door. The husband gets up and goes to the door where a stranger asks, “Can I get a push?”

"No way," says the husband. "It's three o'clock in the morning!" He closes the door and returns to bed.

"Who was it?" asks his wife.

"Just a stranger asking for a push" he answers.

"Did you help him, she asks?”

"No I didn't, it's three in the morning!"

"Well you've got a bad memory" says his wife. "Can't you remember a few months ago when we broke down on holiday and those two guys helped us? I think you should help him."

The man does as he is told and returns to the front door and calls out into the dark "Hello, are you still there?"

"Yes", replies the man in the dark.

"Do you still want a push?" calls out the husband.

"Yes please!" replies the man in the dark.

"Where are you" asks the husband?

"Over here on the swing" the man replies.