In the new movie "17 Again," Matthew Perry wakes up in the 17-year-old version of his own body, which just so happens to look like Zac Efron (and we're sure Perry looked just like Efron as a youngster). We haven't seen the movie yet, but you can bet your own body that wacky high jinx will most definitely ensue, at least if "17 Again" is like all the other body-switching movies Hollywood has made over the years.
Click through to see 10 of the most memorable ones!
"Freaky Friday," starring a 13-year-old Jodie Foster, might be the film that spawned the genre. The precocious Foster swapped bodies with her mom to frightening effect (though not nearly as frightening as it would have been had she traded bodies with Travis Bickle in "Taxi Driver").
"Growing Pains" star Kirk Cameron also tried his hand at the switcheroo, and we're not talking about him trading in the Hollywood lifestyle for Christian evangelism. Cameron swapped bods with Dudley Moore in the 1987 comedy "Like Father Like Son." Like, totally.
"SNL" alumnus Rob Schneider's knucklehead take on the body swap comedy resulted in "The Hot Chick." We somehow missed this one, but feel fairly confident in saying there was plenty of falling down, farting and fairly obvious gender gags.
Alec Baldwin's prelude to becoming a comic genius had him starring in "Prelude to a Kiss," in which his love interest, played by Meg Ryan, swaps places with an elderly man. Incidentally, this premise would also make an excellent episode of "30 Rock."
Right before we fell for Kevin Arnold on "The Wonder Years," Fred Savage had us laughing in the super-wacky body-switcher "Vice Versa." Savage and Judge Reinhold played a father and son who, you guessed it, woke up one morning in each other's bodies! Luckily, the film wasn't peppered with annoying narration from the future.
Remember when Lindsay Lohan was seen as an up-and-comer and not tabloid fodder? If so, you're probably just remembering the remake of "Freaky Friday" from back in the "sweet, cute and not crazy" period of LiLo's career. But alas, all good things must come to an end. "I Know Who Killed Me"? Now that's freaky.
This has to be the definitive body-switcher flick. When 12-year-old Josh wishes to be "Big" and suddenly finds himself in the body of a likable 30-year-old Tom Hanks, he embarks upon an awesome adventure in New York City, where he gets a super-sweet job and lives in a giant apartment and has girls falling all over him, only he's too busy playing with the latest and greatest toys to even notice them. We've been looking for our own Zoltar ever since.
In this updated version of "Big," an unpopular tween girl's wish to be "13 Going On 30" gets granted, and she magically turns into Jennifer Garner. It also made us wonder whether Jennifer once made a real-life wish to be "single going on married to Ben Affleck."
While not a complete swap, Spike Jonze's "Being John Malkovich" centered on several characters (including two played by John Cusack and Cameron Diaz) who use a portal to occupy the brain of a fictional John Malkovich. Not quite as appealing as waking up in Zac Efron's body, is it?
"Oh, God!," another body switch flick? Yep, cigar-wielding comedian George Burns threw his hat in the body barter ring with "18 Again!" Burns played Jack Watson, an 81-year-old businessman who swaps places with his grandson played by a poor-man's Patrick Dempsey, Charlie Schlatter.