I refuse to consider this a “prank”, I consider it scatophilia, it is paraphilia involving sexual arousal and pleasure from feces.
Bozo Beto is a sick freak.
I don’t know if it’s specifically a sexual thrill he gets from it, but when you combine this with the other “pranks” and the story he wrote as a teenager, I think it’s very likely that he’s a psychopath.