The primary element of The Human Centipede series is the human centipede; a grotesque construction of multiple humans surgically conjoined mouth-to-anus with their kneecaps immobilized and each "segment" (barring the first, of course) having to eat the excrement of the person in front of them, creating a single ...
![[CW: human pet guy] (1/2)](https://hexbear.net/pictrs/image/Sha4MhMTmZ.jpg){kind=link}
Reasonably confident this is just the plot from Human Centipede.