"NIGHT SHIFT" joke

A man returned home from the night shift and went straight up to the
bedroom. He found his wife with the sheet pulled over her head, fast
asleep. Not to be denied, the horny husband crawled under the sheet
and proceeded to make love to her. Afterward, as he hurried down- stairs
for something to eat, he was startled to find breakfast on the table and
his wife pouring coffee. "How'd you get down her so fast?" he asked.
"We were just making love!"
"Oh my God," his wife gasped, "That's my mother up there! She came
over early and had complained of having a headache. I told her to lie down
for awhile."
Rushing upstairs, the wife ran to the bedroom. "Mother, I can't believe
this happened. Why didn't you say something?" The mother-in-law
huffed, "I haven't spoken to that jerk for fifteen years, and I wasn't about to start now!"