Take “Fart Gymnasty” as an example. The added fart sounds are the main attraction here, clearly, but notice how they’ve been timed to fit the solemn commentary from the announcers.

Some enterprising Internet user saw the butt-heavy video for "Anaconda" by Nicki Minaj, and thought, "Hmm. Good, but not enough fart noises. I can fix this!" And fix it they did.