Marriage, Timing

Bob got home from work at his usual hour of 5 p.m., only to discover that it had not been one of his wife's better days. Nothing he said or did seemed to be right.
By 7 p.m. things had not changed, so Bob suggested he go outside, pretend he had just gotten home, and start all over again. His wife agreed.
So Bob went outside, came back in and, with a big smile, announced, "Honey, I'm home!"
She replied sharply, "And just where have you been? It's after seven o'clock!" (from Cybersalt.org)