A cop was patrolling at night in a well known spot. He sees a couple in a car, with the interior light brightly glowing.

The cop carefully approaches the car to get a closer look and sees a young man behind the wheel,reading a computer magazine.

He immediately notices a young woman in the rear seat, knitting.

Puzzled by this surprising situation, the cop walks to the car and gently raps on the driver's window.

The young man lowers his window ... "Uh, yes, officer?"

"What are you doing?"

"Well, isn't it obvious? I'm reading a magazine, sir."

Pointing towards the young woman in the back seat the cop says "And her, what is she doing?"

The young man shrugs: "Sir, I believe she's knitting a pullover sweater."

Now, the cop is totally confused. A young couple... Alone, in a car, at night in a lovers' lane. And nothing obscene is happening!

"What's your age, young man?"

"I'm 25, sir."

"And her ... what's her age?"

The young man looks at his watch and replies:

"She'll be 18 in 11 minutes."