"In Need Of A Push" joke

A husband and his wife are awoken at 3 o'clock in the morning by pounding on the door. The husband gets out of bed, goes to the door and finds a drunken stranger asking for a push.
"No way," the husband says, "It's three o'clock in the morning!" He closes the door and returns to bed.
"Who was that?" asks his wife.
"Some drunken stranger asking for a push," he replies.
"Did you help him?" she asks.
"No, I did not... it's three in the morning!" he says.
"Well, you certainly have a short memory," says the wife. "Don't you remember a few months ago when we broke down on vacation and those fellows helped us? I think you should help him."
The mans does as he is told and goes to the front door and calls out into the dark, "Hello... are you still out there?"
"Yes," comes the answer.
"Do you still want a push?" the husband calls out.
"Oh, yes please!" comes the reply from the dark.
"Where are you?" the husband asks.
"Over here on the swing," replies the stranger.