He's lying.
"We got to 10 and I said 'Why don't I hit a couple of drives off 10, then we'll go get something to eat?' Well, 10 is a little left-to-right hole and Michelle has been known to do headstands during the course of our courtship and marriage, prior to even [their son] Joey arriving on the scene. So she did a headstand at the end of the tee box for good luck, out and to my left.
"At the exact moment that I was teeing off, she decided, with her feet in the air, to do the splits, thereby dropping her right leg a little bit to the side, right in my line of fire. I hit a golf ball, TaylorMade, with little designs on it, into the inside of her right ankle and shattered it."