The mark
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How to get a bunch of random people to take a picture of their arm and post it online.
Choice A: ask everyone to post take a picture of their arm and post it
Choice B: Make it completely absurd statement as if it were absolute truth thereby challenging everyone to prove you wrong
There was a very fun defcon talk a while back about how easy it is to (among other things) create a convincing set of prosthetic fingerprints from social media posts showing off jewelry or handchecking vapes/guns/knifes/etc.