Mr. and Mrs. Thompkins, who've been very happy together for 12 years, currently, are experiencing a phase of boredom and stagnation. To change things up, Mr. Thompkins gets an idea: Have sex in a near-by graveyard.
With a mix of reluctance and excitement, Mrs. Thompkins agrees and they go off to make love in front of a--formerly--live audience. The pair finds a flat tombstone to lay down upon and begin kissing, rubbing, thrusting. The sex is incredible; their faint spark ignites into a supernova.
Perhaps going a little too hard, Mrs. Thompkins gets a really bad pain in her hip, after they finish. Next day, in the early afternoon, she goes to a doctor to make sure there isn't a serious sprain. Her physical and body inspection are done, and she patiently waits to receive the results.
Before too long, the doctor returns to her with a bewildered expression on his face."Well, Mrs. Thompkins", he says, "there is no fracture or sprain, just a simple over-extension of the muscle tissue; take things slow when you move and it'll straighten out in a few days.
"Oh, thank goodness", she says, hand covering her heart in relief. "And thank you, doctor!"
The doctor's forehead creases. "Ma'am, may I ask you one, somewhat unrelated, question? A slightly strange question?"
Mrs. Thompkins, now befuddled herself, answers "Sure. Go ahead."
"Exactly how old are you?"
"I'm 41. Doesn't it say that on my file? Born on February 7th, 1982."
"Well, yes it does---but on your left ass-cheek, it says you died on August 12th, 1917."