Another month, another viral challenge.

This month, it’s the Milk Crate Challenge, where brave contestants must pass over a pyramid of plastic crates stacked high above the ground without falling. The seemingly easy feat has been successfully completed by a few, while ending in disaster for many who test their luck.

While crates individually can actually hold up under pressure, stacked up into a pyramid creates a situation of instability for the person trying to get to the other side.

Videos of the challenge surfaced on TikTok and soon spread to Twitter as social media users marveled at the contest, some wondering where the milk crates to build the pyramid even came from in the first place.