The mother in law arrived home and found her son in law Paddy in a steaming rage and packing his suitcase.
"Whats going on, Paddy, what happened??"
"What happened? .. I'll tell you what happened! ... I sent your daughter an email last night, saying that I would be home today from my fishing trip.
When I get home, guess what I found? Yes, my wife Jean, your daughter, naked in our marital bed with Sean, from next door!
This is unforgivable, the end of our marriage! I'm done, I'm leaving forever!"
"Ah, now, calm down Paddy, calm down. Theres something odd about this, Jean would never do such a thing! There must be a simple explanation!
I'll have a few words with her and find out what happened!"
A few moments later she returned with a big smile on her face.
"Paddy, I told you there was a simple explanation ... She hasn't checked her email since yesterday afternoon!"