Joke: A mother-in-law arrives home from the mall to find her son-in-law boiling angry and hurriedly packing his suitcase. "What happened?", she asks anxiously. "What happened! I'll tell you what happened. I sent an email to my wife telling her I was coming home today from my business trip. I get home, and guess what I found? Yes, your daughter, my wife, with a guy in our bed! This is unforgivable, the end of our marriage. I'm done. I'm leaving forever!" "Calm down, calm down!" says his mother-in-law. "There is something very odd going on here. My daughter would never do such a thing! There must be a simple explanation. I'll go speak to her immediately and find out what happened." Moments later, the mother-in-law comes back with a big smile. "I told you there must be a simple explanation... she didn't get the email."