The much anticipated new movie 17 Again, starring Zac Efron, hit theaters last Friday and achieved the number one spot at the box office over the weekend. But how "new" is the movie? The plot may be something we've seen before, as a 37-year-old who is unhappy with his life goes back to being 17 so he can relive his glory days. Things aren't exactly easy for him, especially since the trends have changed, he has to make all new friends, and he is in high school with his children. While the story is slightly different from other body-swapping movies, the general concept is the same. Here is a look back on some of these movies.

Big - Tom Hanks won a Saturn Award for Best Actor in this movie about a boy who makes a wish to be big. He wakes up the next morning to find himself in the body of an adult yet still with the same 12-year-old mindset. Hanks' character gets a job at a toy company, develops a relationship with a female coworker, and struggles to be a grown-up while he's still just a kid at heart.