"Uncle Frank" joke

Ed called home one afternoon to see what his wife was making for dinner.
"Hello?" said a little girl's voice. "Hi, honey, it's Daddy," said Ed. "Is Mommy near the phone?"
"No, Daddy. She's upstairs in the bedroom with Uncle Frank."
After a brief pause, Ed said, "But you don't have an Uncle Frank, honey!"
"Yes, I do. He's upstairs in the bedroom with Mommy!"
"Okay, then. Here's what I want you to do. Put down the phone, run upstairs, knock on the bedroom door and shout in to Mommy and Uncle Frank that my car just pulled up outside the house."
"Okay, Daddy!"
A few minutes later, the little girl came back to the phone.
"Well, I did what you said, Daddy."
"And what happened?"
"Well, Mommy jumped out of bed with no clothes on and ran around screaming, then she tripped over the rug and went out the front window and now she's all dead."
"Oh my God! And what about Uncle Frank?"
"He jumped out of bed with no clothes on too and he was all scared and he jumped out the back window into the swimming pool, but he must have forgot that you took out all the water last week to clean it, so he hit the bottom of the swimming pool, and now he's dead too."
There was a long pause, then Ed said, "Swimming pool? Is this 555-7039?