Harry Potter, Ron Weasley and Hermione Granger are best friends ever since first-year. It's their third-year currently in Hogwarts. One day Hermione and Harry and Ron were walking around in Hogsmeade when Hermione accidentally made a mistake that made them go back in time. They got back in time where its their first-year.

Ron Weasley: Where are we?

Hermione Granger: Oh no, we got back in time.

Harry Potter: What?!