Sally loves styling hair. She does it all the time to her dolls and sometimes does it to the other pastas (with their permission of course).
Jeff actually really likes it when Sally styles his hair but since he doesn't want anyone to know that, he'll complain throughout the process, such as "You're gonna make me look like a girl!" Or "I can't believe I agreed to this bullshit..." and many more. He always whispers a thank you to her afterwards, however.