An incredible series of videos swap famous Hollywood faces to demonstrate how convincing 'deepfake' tech has gotten - take a look

1. Heath Ledger's portrayal of the Joker in "Batman" is put in "A Knight's Tale" instead.

2. Bill Hader doing impersonations on Conan O'Brien's show morphs into the person he's impersonating, Arnold Schwarzenegger.

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3. The "Fight Club" scenes offer a clearer look at the personality disorder at the center of the movie.

Check it out in the video below:

4. A second scene from "Fight Club" offers another look at how the tech can be used:

You can watch it here:

5. And finally, one more with Bill Hader — this time as Al Pacino.

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