Humm

One Friday night, a policeman saw a car parked up at "makeout point." Shining his flashlight in the window, he saw a young
man fidgeting in the front seat glancing at his watch and a young woman sitting in the back seat and reading a magazine.

"Excuse me, son" said the cop, "but how old are the two of you?"

"I'm eighteen, sir, and" (checking his watch another time) "in ten more minutes, she'll be eighteen too!"