There's an entire genre of films that can be neatly summed up by the following three words: high school sucks. Because it usually does, but as common wisdom goes, we grow up and get over it, for better or worse. In the movies, this means acne clears up, glasses are traded for contacts, weight is lost or redistributed in a more socially acceptable manner, and awesome careers are the rewards for all those hours spent in the library.
'You Again's heroine Marni is supposed to be proof of this. As high school Marni, Kristen Bell is decorated with fake acne, stringy hair, glasses, terrible coordination, and braces. Fast forward eight years or so, and she's a glowing publicist, an ironic job for someone who should have learned long ago that image isn't everything. Unfortunately, all that success and experience accrued go out the window when she finds out her perfect older brother Will (Jimmy Wolk) is marrying the cheerleader who made Marni's life hell in high school. Everyone in her family, including the dog, adores Joanna (Odette Yustman), who pretends not to remember Marni. Marni's mom Gail (Jamie Lee Curtis) is full of empty platitudes about forgiving and forgetting, until Joanna's Aunt Ramona (Sigourney Weaver) shows up on the scene. See, part of Joanna's rebirth as a saintly nurse who volunteers for a suicide hotline, etc., is that her parents died, and Ramona has stepped in to fill their shoes. Except Ramona was once Gail's nemesis, and so these two grown women also regress to their most base high school instincts.