A 15-year old boy was laying on a stretcher with his mother sitting next to
him.

The boy was coming down from "crank" (methamphetamine) that he had
injected into his veins with needles he had been sharing with his friends.

Concerned about this the doctor asked the boy if there was anything he
might have been doing that put him at risk for AIDS.

The boy thought for a
while then said questioningly, "I've been fucking the dog?"