In the wee hours of the morning, Jeff was awakened by the sound of the telephone. He stumbled to the kitchen and picked up the phone. “Is Robert there?” a female voice asked.

“No, I’m afraid you have the wrong number,” Jeff replied.

“Is this 555-1212?” the woman asked.

“No,” said Jeff, “this is 555-2121.”

“Oh, I’m so sorry for disturbing you,” the woman said.

“That’s alright,” Jeff said, yawning. “I had to get up to answer the phone anyway.”