Crankle Scoff

When "the kids" pose for a picture, placing a finger to their lips and scrunching their face to the the side like they are confused. Usually involves surprised, very pretty, well eye-lined eyes. Seems to have infected the teenage group like 80s metal hair did my generation.

All these kids do a crankle scoff in every one of their pictures, what is it they are so confused about, and who started this new look?