The email

From The Laughter Club:

The mother-in-law, comes home and finds her son-in-law furious and packing his suitcase."What happened?" 

"What happened? I'll tell you what happened! I sent an email to my wife, your daughter! saying that I was coming home from my trip today. I got home and guess what I found?...My wife, your daughter, yes my Mariam, with a naked guy on our marital bed! This is the end of our marriage, I will leave forever" 

"Calm down!" says mother-in-law. "There is something odd about this story. Mariam would never do such a thing! Wait a minute while I check what happened." 

Moments later, mother-in-law comes back with a big smile. "You see, I knew there must be a simple explanation....Mariam didn't receive your email"