As the man threw on his clothes, he told the woman to take his shoes outside and rub them through the grass and dirt.
Mystified, she complied nonetheless. He proceeded to slip his shoes on and drove home.
"Where have you been?" demanded his wife when he entered the house.
"Darling," replied the man, "I can't lie to you. I've been having an affair with my secretary. I fell asleep in her bed and didn't wake up until now.
The wife glanced down at his shoes and shouted: "You liar! You've been playing golf!"