A thread in reddit showed several examples of this last week, I thought it was interesting but didn't believe it had traction.
Sheriff: 16-year-old girl rescued in Kentucky after using hand gestures from TikTok
https://www.wect.com/2021/11/05/police-16-year-old-girl-rescued-kentucky-after-using-hand-gestures-tiktok/
Interesting. That's knowledge that's good to have that I hope I will never use.