My name is Elizabeth

There was a married couple sleeping and an intruder entered into their house. The intruder put a knife to the neck of the woman and said, "I like to know the names of my victims before I kill them, what is your name?"

"My name is Elizabeth," the woman replied.

The intruder said, "You remind me of my mother who was also named Elizabeth, so I can't kill you."

The intruder then turned to the husband and asked, "What is your name?"

" My name's Phillip, but my friends call me Elizabeth."