Nicolas Cage's performance in this movie will either amuse you or annoy you to no end (so, basically, it's pretty much in keeping with most of his other performances), but Kathleen Turner's performance as a woman who goes to her high school reunion and then wakes up in the body of her teenage self is fantastic.
Can't have a body switch list without including Freaky Friday. The original stars a young Jodie Foster, the remake stars career criminal Lindsay Lohan. I've only seen the former, but I'm told that the latter provides a nice updating on the story.
In Big Tom Hanks wishes to be, well, big and while he physically gets his wish, his childlike approach to the world makes him stand out from everyone around him.
The story of a man prematurely sent to the afterlife who gets to return as a millionaire is so winning that, in addition to the original stageplay, it's been adapted to film three times with Here Comes Mr. Jordan (1941), Heaven Can Wait (1978), and Down To Earth (2001).
Okay, so this isn't about a body switch so much as it's about taking up temporary residence in John Malkovich's psyche, but it's such a great movie that surely its inclusion can be excused.