A man and his wife are awakened at 3 o'clock in the morning by a loud pounding on the door. The man gets up and goes to the door where a drunken stranger standing in a pouring down rain is asking for a push.
 "Not a chance" says the husband -- "It's three o'clock in the morning!" He slams the door and returns to bed.  
 "Who was it?" asks his wife.  
 "Just a drunken stranger asking for a push" he answers.  
 "Did you help him?" she asks. 
 "NO, I didn't -- it's three in the morning and raining out!"
"Well, you've got a short memory" says his wife.  "Can't you remember about three months ago when we broke down on vacation and those two guys helped us? I think you should help him." 
  
The man does as he is told and gets dressed and goes out into the pounding rain and calls out into the dark. "Hello-- are you still there?"
 "Yes," comes the answer.
 "Do you still want a push?" calls out the husband.
 "Yes, please!" comes the reply from the dark.
 "Where are you?" asks the husband.
 "Over here on the swing" the drunk replies.