Seeing as its April Fools Day, you're probably going to see a few prank videos doing the rounds today.
This, however, is pretty clever. Maths professor Matthew Weathers came up with this ingenious prank in front of his students involving a video, a light-stick, some kind of a cloth and a lot of commitment. As it turns out, Professor Weathers has been doing this for a number of years for his students and they're getting more intricate.
For example, in 2015, his very first prank managed to hit 14,971,030 views and it looks like his prank this year is just as detailed.
Take a look.