Doctors and safety experts are warning of the dangers of a new social media craze coming out of the US - the Milk Crate Challenge.
It involves stacking up US-style plastic milkcrates in a stair arrangement and attempting to climb up them, with many of those who try usually filming their inevitable failure.
Videos featuring the antics, which can involve any type of precariously stacked crate, have received millions of views - mostly in the US, but increasingly in the UK.
In an effort to prevent others from sustaining serious injuries, social media platforms like TikTok - which is said to have been where many of the videos have been posted - have removed content featuring the 'challenge', according to NBC News.
And one doctor, Dr Vonda Wright, an orthopaedic surgeon based in Atlanta, Georgia, said she and other surgeons have been sharing videos of those taking part and encouraging those who 'like' what they see not to join in.
She told NBC News: "This is probably the [craze] that I've seen that has the highest potential for bodily injury that will take people out not just of their daily lives, but could have lifelong implications."
She said someone attempting the challenge could sustain injuries such as a wrist fracture, a forearm fracture, a broken femur, a torn anterior cruciate ligament (ACL), or a concussion with a head bleed that could potentially lead to problems long into the future.
Many of the videos posted online feature people who the poster says has broken a limb or show people receiving a head or back injury.
TikTok has disabled the ability to search for the term "milk crate challenge" amid those concerns.
A spokesperson for the platform told NBC News: "TikTok prohibits content that promotes or glorifies dangerous acts, and we remove videos and redirect searches to our community guidelines to discourage such content. We encourage everyone to exercise caution in their behaviour whether online or off."
It is thought the craze started earlier this month after a video was posted on Facebook of a woman climbing a set of crates and then falling as she reached the third step.
During the videoing of one attempt of the challenge, outside a school in Shreveport, Louisiana, three people were shot dead in a drive-by attack, but it's not known if it was directly connected to what was being attempted.
Source: Sky News