John and his wife were sleeping when they heard some sounds coming from downstairs. They called 911 and reported that someone had probably broken into their house.
But before the cops could arrive, a nasty serial killer entered their bedroom. The intruder put a knife to the neck of John's wife and growled, "I always ask my victims their names before I murder them - so tell me your name?"
"Rosemary," the woman sobbed. The criminal said, "You remind me of my sister whose name was the same as yours, so I shall spare your life."
The criminal then turned to John and demanded his name.
Sweating profusely, he replied, "John.......but my friends call me Rosemary!"