17 Again (2009)

Most people think so. 83% of audiences gave it a thumbs up based on 5,369 votes. Critics scored it lower at 52%, but audiences disagreed.

On the brink of a midlife crisis, 30-something Mike O'Donnell wishes he could have a "do-over." And that's exactly what he gets when he wakes up one morning to find he's 17 years old again. With his adult mind stuck inside the body of a teenager, Mike actually has the chance to reverse some decisions he wishes he'd never made. But maybe they weren't so bad after all. Wikipedia ↗

17 Again is a 2009 American fantasy comedy directed by Burr Steers. Matthew Perry stars as Mike O'Donnell, a man whose life didn't turn out as planned — he's stuck in a dead-end job, his wife is divorcing him, and his teenage children don't respect him. When Mike is magically transformed back into his 17-year-old self, played by Zac Efron, he enrolls in his children's high school hoping to relive his glory days and fix the moment where his life went wrong.

The comedy arose from the inversion of the typical teen movie — Zac Efron's "Mike" is actually a 37-year-old man dispensing adult wisdom in a teenager's body, and his horrified discovery that his son is bullied and his daughter is dating the school bully gives the transformation genuine emotional purpose. Zac Efron's charm and comedic timing were well-suited to playing a middle-aged man in a young body. 17 Again earned $136 million worldwide on a $20 million budget.