The "Duck Face" is a derogatory facial expression that has brought much fear to many video and photo cameras.
Although the date of creation of the duck face may go forever unknown (similar to the lost book of the Old Testament where jesus rides a dragon), there are numerous sources that may have been the spark of this cursed catastrophe.
1) The 2000 film, Zoolander, in which Ben Stiller makes his infamous model expressions of Blue Steel, Lategra, Magnum, etc.
2) It may be unbelievable or even stupid, but we cannot doubt the possibility of the kissy face given by Marilyn Monroe in this photo.
Pucker up, Butter-cup.
To not establish a duck face for a photo, one must never push their lips both against eachother and outward in a "I'm gonna totally gonna suck on your sippy-straw" fashion. If one were to study such a facial expression with serious scientific purpose, insanity would likely set in from the hopes that people who make the duck face may change their expression for a next picture.
"I've never seen something so pretty! It's 'I wanna stab myself' pretty!"
Even with good intentions, such as making an affectionate "kissy" face, it has a good chance of being viewed by the ravaging, hypocritical internet populous (mostly from the /b/) as another example of someone who should be buried in a pile of horse feces.
HELP STOP THE DUCK FACE! DON'T MAKE THE DAMN EXPRESSION ON CAMERA, and if possible, EVER IN YOUR DAMN LIFE.