Another dumb TikTok challenge is resulting in the injury of not the stupid TikTok user, but innocent bystanders. It's called the Orbeez Challenge.
Orbeez are small, round "superabsorbent polymers" which grow 100x their original size when submerged in water. They're extremely popular with young kids and generally serve as a fun sensory activity (just as messy, if not more, than slime). Originally, they were used to maintain moisture in plants (you have have seen them in flower vases back in the day).
TikTokers/teenagers are taking gel pellet guns (think airsoft/paintball style guns with a top-loading chamber that holds Orbeez). The entire goal of the challenge is to sneak up on shoot an innocent bystander with Orbeez There have been reports across the country of incidents resulting in injuries and arrests.
Police are warning about the danger of firing toy guns at others and encourage people to report the attacks when they happen. Additionally, what is thought to be funny is potentially a felony (if the pellet breaks the skin). TikTok has community guidelines that prohibit videos "depicting, promoting, normalizing or glorifying dangerous acts that may lead to serious injury or death."