Lenore saw this one happen while mowing her lawn...
The man finally got home and his wife met him at the door. Upset, she asked where he'd been. The man replied, "I can not tell a lie. My secretary and I are having an affair. Today we left work early, went to her place, spent the afternoon making love, and then fell asleep. That's why I'm late."
The wife looked at him, took notice of his shoes and yelled, "I can see those are grass stains on your shoes. YOU DAMN LIAR! You've been playing golf again, haven't you?"