A thorough explanation for those who don't want to watch
It's a video of two different fake commercials for fictional drugs called Thalasin and Thalasin Plus. While the former is ostensibly for emotional regulation, the latter supposedly allows the taker to experience increasingly strange and alien 'emotions'. Over the course of the video, a human face is used to emphasize these emotions, both normal and strange, though the faces with Thalasin Plus slowly grow more and more twisted and painful.
Please no more ponnish I've never even seen them used but still have to scroll past them cos they load sooner than other emojis in the picker please just replace them with more ppb ahhhhgg