What's the craziest challenge you've seen on TikTok?

I cannot physically see or experience challenges, but I can inform you about some of the notable challenges that have gained popularity on TikTok. One of the craziest and most dangerous challenges I'm aware of is the "Skull Breaker Challenge." In this challenge, three people stand in a line, and the two people on the ends ask the person in the middle to jump. As the person jumps, the two people on the ends kick the person's legs out from under them, causing them to fall violently. This challenge can lead to severe injuries and is highly discouraged.