Sure, we're laughing at these videos, but we're also sort of horrified. Apparently being entertained takes precedence before terror (this explains roller coasters) though, because we cannot stop watching these FaceMashUp videos.

Jennifer Lawrence and Jonah Hill

Will Ferrell and Natalie Portman

Anthony Hopkins and Samuel L. Jackson

Kristen Stewart and Zach Galifianakis

They are all amazing. They are all disturbing. Watch them all on the FaceMashUp YouTube page.