Found this site with a bunch on Quicktime movies of people getting punched in the face in slow motion. Nice reference if you want to model a face getting hit. 
The site is giving a 503 error now. You can also find a remix of all the movies here.
http://www.dailymotion.com/relevance/search/punch/video/x5idi3_punches-remix_creation
that was rather amazing… I never imagined the human face as being so… jiggly
Yeah, it was beyond my imagination. Very funny 