YouTuber Chase creates short videos where the faces of celebrities are swapped for other celebrity faces. The results are weird and often hilarious. The best one is probably the most recent video of Natalie Portman and Will Ferrell:
This quick Nicholson/Cruise clip from A Few Good Men is pretty good too:
Co.Create did an interview with the creator.
“When picking the celebrities, I am mainly considering two things. Their relevance and popularity, as well as the availability of unique, high-quality footage in which the actor is looking mostly towards the camera,” Chase says. “Mashing up footage in which the characters are constantly looking side to side is much more difficult and usually results in a less convincing final product.” He adds. “There have a been a few After Effects sessions that ended up in the recycle bin because of this.”