"Checking up on Mum." joke

Saturday morning... and Bob's just about to set off on a round of golf
when he realises that he forgot to tell his wife that the guy who fixes
the washing machine is coming around at noon.
Bob heads back to the clubhouse and phones home. "Hello?" Says a little
girl's voice. "Hi, honey, it's Daddy," Says Bob. "Is Mammy near the
phone?"
"No, Daddy. She's upstairs in the bedroom with Uncle Frank."
After a brief pause, Bob says, "But you haven't got an Uncle Frank,
honey!"
"Yes I do, and he's upstairs in the bedroom with Mammy!" she replies.
"Okay, then. Here's what I want you to do?? Put down the phone, run
upstairs and knock on the bedroom door and shout in to Mammy and Uncle
Frank that my car's
just pulled up outside the house."
"Okay, Daddy!" she says.
A few minutes later, the little girl comes back to the phone.
"Well, I did what you said, Daddy." "And what happened?" he asks.
"Well, Mammy 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 dead." "Oh my god... And what about uncle Frank?" he asks.
"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 last week you took out all the water to clean it, so he hit
the bottom of the swimming pool and now he's dead too."
There is a long pause, then Bob says, "Swimming pool? Is this 8547039?"