I remember back in January, there was this video [1] that kept showing in everybody's recommended videos, similar to the "1000 DEGREE EXPERIMENTAL KNIVES" video from MrGear [2]. It became popular very quickly and so the trend started.
[1] https://www.youtube.com/watch?v=mP-tqMKqDAQ
[2] https://youtu.be/hjSheQ7LgJ4