Simple Sxplanation

A father shows up at his daughter's home and finds his son-in-law angrily packing his bags.

"What's wrong?" he asks.

"I texted her that I was coming home today from my golfing trip. And what did I find when I walked through the door? Her making out with Joe Murphy! I'm leaving!"

"Now, calm down," says his 
father-in-law. "There must be a 
simple explanation. I'll find out what happened."

Moments later, he reappears. "I told you there was a simple explanation, and there is," he says. "She never got your text."