Retell the Most Recent Joke You've Heard as a Short Piece of Fiction (for my kid, who loves telling this joke)

Sarah had heard a knock on her door. This was her first night living in the city one thousand miles away from her hometown, and she was getting a little jumpy. The door kept knocking, it was 2pm so she thought it must be her new roommate She peeped thought the eyehole.
No one was there.
"Hello? Who's there?" Sarah called.
Nobody answered.
"Who's there?"
Again, silence.
Sarah opened the door a crack, then a crack more.
in the middle of the hallway, she found a banana.
She peek out, turned her head left, then right. There was nobody in the hall. "This mush be some type of hazing trick." She thought to herself. Sarah grabbed the banana off the hallway floor and went inside, locking the door behind her.

2 hours later, as she was unpacking her kitchen and getting ready to order dinner, she heard another knock on her door. "COMING!" She yelled as she strode toward the door, her cat following in her wake.
The knocks sounded closer together.
"WHO'S THERE? ASHLEY? IS THAT YOU?' Sarah called while getting into tiptoe position in an attempt to peep through the eyehole once more.
There was nobody there.
Sarah opened the door, and - sitting on her welcome mat- was another banana.
"OKAY GUYS, I GET IT. VERY FUNNY!!!" she yelled while entering the dead silent hallway. She opened her ears and listened hard for any signs of life. All she got was silence in return.
She turned to her cat: "It's really quiet for a Saturday afternoon." while picking up the banana. Sarah walked inside, locking the door behind her.