It's Free On Your Birthday

My son and I celebrated our mutual birth date by treating each other to dinner. When we arrived at our favorite restaurant, we were delighted to see a large sign at the entrance proclaiming that each birthday person, upon presentation of suitable I.D., was entitled to a free meal. When it was time to pay the bill, I felt guilty that we were paying for only our drinks and offered to pay for at least one of the meals.

"Not at all!" our genial matre d' exclaimed. "That's the deal. But you must have friends? Other children?"

"Well," I replied, "my daughter usually comes with us on this date to celebrate..."

"There!" he said. "Bring her next year. She'd be most welcome."

"That's great!" my son exclaimed. "My twin sister loves prime rib!"