Thursday night, users on the anonymous messageboard 4chan came up with the idea of the #PlasticBagChallenge. It’s a parody of the #CharlieCharlieChallenge, which trended last week.
The details of the challenge are a little different depending on which tweet you see, but basically, if you put a plastic bag over your head it'll somehow raise money for wildlife charities.
In this version the WWF will donate $5 for every minute you can keep the bag over your head.
People even started "challenging" other people to make it look like more of a thing.
And there are claims of celebrity endorsements.
4chan users found this video from February of a guy asphyxiating himself with a plastic bag and started sharing it again.
And a few people even posted photos.
So if you see this, just remember, it's fake, and you definitely shouldn't put a plastic bag over your head.
Ryan Broderick is a reporter for BuzzFeed News and is based in London.
Contact Ryan Broderick at firstname.lastname@example.org.
Got a confidential tip? Submit it here.