From "Nightclub photography: you're doing it wrong" by Jamie Zawinski, 2011-05-17, and some of the comments posted under it:
jwz: And finally, some simple admonitions for the subjects of photos. I know some people are uncomfortable having their picture taken, and don't know what to do with themselves, but please, don't do these things. These are so common and awful that I delete all photos in which they occur:
Stop making "duck face". Seriously, stop it. You look like an idiot.[...]Spoon00: If you make a duck-face I should be allowed to hunt you. Nils: Not if it's wabbit season! Adam: DUCK SEASON!
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