We've had the ice bucket challenge, the cinnamon challenge, the Kylie Jenner lip challenge and the mannequin challenge.
As these blink-and-you'll-miss-them social media trends grow ever more ridiculous, the internet has hit upon its most risque craze yet - the one-finger selfie challenge.
The female photographer stands in front of a mirror and snaps herself naked except for a strategically placed finger that covers her genitals and breasts when reflected.
The concept originated with an illustration by Japanese anime artist Sky-FreeDom, which shows a naked girl using one finger reflected in a mirror to cover her breasts and private parts.
has even made a video showing how to achieve the perfect image.
It could be one of the most controversial trends yet. Not only does it involve near-nudity, Teen Vogue slammed it as an "open door for body shaming".
But at least one person has made the challenge liberating, with transgender blogger Delia Melody posting her own version on social media with the caption: "Yes, I'm #transgender, yes my boobs are real, No, I haven't had "The Surgery™" and yes, I nailed the #onefingerselfiechallenge."