After Voldemort smashed shit up in Hogwarts, Harry, Hermione and Ron were pushed into a Muggle school in the bad part of town. Some horrible things happened there. These things.
1) Some wise guy draws a cock on Hermione's pencil case.
2) Harry learns the phrase 'Bitch, please'
3) Hermione can't resist correcting Brittni's grammar when she threatens to 'shank y'all'...
...and they have to Crucio her ass to avoid said shanking.
4) Some bigger boys show Harry 2 Girls 1 Cup.
5) Hermione gets ripped off for a 20-bag.
6) Hermione learns the phrase 'Twerk it'.
7) Seeing what happens under the bleachers ages the trio beyond their years.
8) 'Weird Tara' draws a picture of Hermione and gives it to her.
9) Ron discovers glue and cheerleaders.
10) Taco Day in the cafeteria.
The world of Muggle High School blew the wizarding trio away. Nuff said.