Police in the United Kingdom have issued a warning about a new viral teen craze potentially endangering the lives of young people and the emotional well-being of their parents, and it has nothing to do with Tide Pods.

The “24-hour IKEA Challenge” encourages people to hide in IKEA (preferably by building pillow forts or something similar) overnight before reappearing the next morning—unnoticed—and sneaking out of the building. It’s not poisonous, but it’s still a terrible, terrible, dangerous idea.

Do not do the 24-hour IKEA challenge, or like 11-year-old Kaden Mirza from Sheffield, UK, you will be reported missing by your parents and cause a great deal of worry and anxiety. Also, if you do the IKEA challenge, you could fall victim do any number of dangers that crop up in a warehouse setting.

“Warehouses and shopping departments contain large quantities of heavy stock and items that could easily fall and crush someone if they are moved incorrectly, or used to build makeshift forts,” Anna Sedgwick, detective inspector, said in a statement from IKEA.

So yeah, don’t do the 24-hour IKEA challenge. DON’T. (h/t Mashable)