Photo: rent-a-moose
Jowling (also known as slap n' flap) is a fun portrait photography where you get your subject to relax their facial muscle completely and then shake their head from side to side. Then you snap away (hopefully one of the pics will come out perfectly silly!)
Link | Why, there's a website specifically for jowlers ("where distortion is cause for celebration") - via Didn't You Hear?