In a flashback to the 3rd Grade, Mackenzie, Brittnay,and Shay are playing in a sandbox when Rachel walks up and begins talking about The O.C. with them. Mackenzie tries to ask Shay a question, but notices that she is crying because her hair was shaven off because of her head lice. Mackenzie and Rachel try to tell her that it's not that bad, but Brittnay tells then that it awful. Mackenzie asks the girls if they are excited about cheer tryouts and they all agree that Shay is going to be the head cheerleader. Meanwhile, after Tanner beats Matthew in Pokemon, Matthew, in a fit of rage, tries to throw a hacky sack at Tanner, but misses and hits Shay in the head, making her deaf in her right ear. Brittnay starts to beat up Matthew, but then ends up making out with him. Shay then goes to the nurse and is unable to participate in cheer tryouts, thus Mackenzie is named head cheerleader of the Meadow Lane Elementary Mustangs.
In present day, Shay is telling Deandra about why she hates Mackenzie Zales.
Back in 3rd Grade, Brittnay returns to the sandbox to witness Rachel eat a roly poly. Brittnay then tells Rachel they will never be friends again.
This is one of the few episodes to reference the Van Burens' lice infestation. In this case, Shay is shown having her head shaved to get rid of the lice.
Matthew Derringer is responsible for the rivalry between Shay and Mackenzie, since he hit Shay in the head with a hacky sack, making Shay unable to attend cheer tryouts and let Mackenzie become head cheerleader instead of Shay.