Jess remembers that her twin brother, Jack, had made her the flower "girl" for his wedding tomorrow as a joke. He never missed an opportunity to insert a "little sister" gag into their relationship. Imagine letting two minutes and thirty seven seconds while you were a screaming, newborn baby go to your head.
But, imagine his face if she walked down the aisle suddenly a little girl. Running with this idea she scrolled through the options until she found one that would produce younger versions of the user.
She shifts the age bar down and watches herself on the screen slowly drop back to high school then middle school then elementary school until finally ending with an adorable little girl sucking her thumb.
Jess pays and wonders how she's supposed to put on something so small, but the clerk assures her the technology accounts for that. After purchasing a flower girl dress and some other accessories, Jess returns home and goes to bed already laughing at how she's going to shock Jack tomorrow.