A married man and his secretary are having an affair. They decide to leave the office early one day and go to the secretary's apartment for an afternoon of lovemaking. They fall asleep and don't wake up until 8PM later that night. They quickly get dressed and the man asks his secretary to take his shoes and go rub them in the grass. The secretary thinks this is pretty weird, but she does it anyway.
The man finally gets home and his wife meets him at the door. The wife is very upset and asks him where he has been.
The husband replies, "I can not tell a lie. My secretary and I are having an affair. We left work early today, went to her place, made love all afternoon, and then we fell asleep. That's why I'm late!"
The wife looks at him, takes notice of his shoes and says, "I see those grass stains all over your shoes. You've been playing golf again, haven't you!"