As you'll see from the compilation above, teenage girls (and some boys) have been inflating their lips to ridiculous proportions—resulting in the media having a field day—in an attempt to look like Kylie Jenner.
It's been trending as the #KylieJennerChallenge and involves kids putting their lips in glass bottles or shot glasses and sucking the air so their lips swell.
The results have been well documented on the internet, but generally end up with the practitioner looking something like this:
Basically you end up temporarily deforming your face, so unless you want to look like a freak it isn't recommended whatsoever.
Cosmetic surgeon Dr Esho, of le beau ideal, warns, "This craze is very concerning and can have serious consequences for the young girls involved. There have been cases of severe bruising, severe swelling, fat necrosis ( when fatty tissue around the lip dies). Also women who have already have had lip fillers doing this have caused their previous fillers to migrate, causing distortion to their lips."
Even Kylie Jenner herself has spoken out about it.
Glad that's all cleared up then. Meanwhile the rest of twitter, as is standard practice in these situations, was busy mocking those who tried out the woeful technique.