It’s a movie plot, actually. How would anyone know if the fly near you was once actually a human being?
Twitter user Joe Carnegie informed the Internet about SS Rajamouli, a Tollywood director (different Indian style and language from Bollywood) the director of the movie where that viral clip was from - where a man gets killed by a gangster, and then after being reincarnated as a fly gets his revenge (as a fly, I might add). This unique plot added with the whole movie’s aesthetic attracted the eyes of the Internet, and maybe even yours after this!
For example. This is from a movie where a man gets reincarnated as a fly after a gangster kills him, and then he, as a fly, takes down the entire mob pic.twitter.com/dqdzj4p0fC— Joseph Carnegie (@JoeCarnegie) August 7, 2019
image credit: Twitter