Transported into the movie or TV world


"Every man can make a difference"
I’m looking for any movies, or show, that is about a character who is transported into the universe of a movie or TV show in their world. Examples are like Pleasantville or The Final Girls. Any genre is acceptable.

"How tall is King Kong ?"
A Frank Dubosc vehicle by Yann Moix, if you dare :

I personally didn't bother.

The Purple Rose of Cairo may or may not qualify. Also, possibly Wandavision. Depending on the limits you put to your definitions.
Get working on your custom lists, people !

Buster Keaton's "Sherlock, Jr."