The snail has been taken over by parasitic flatworms that control it to seek out exposed spots and pulsate inside of their eye stalks to get eaten by a bird and enter the next stage of their life cycle, which they spend by living in the birds cloaca and spreading their eggs via feces.
Guys am I the one not getting it or being insensitive toward the snails or is this just the classical "mildly alters behavior of intermediate host in order to spread to host more easily" again?
I may just have became desensitized to these things over the years, but if I could choose between having my eyes plucked out or dying I'd certainly choose the former, and that's not even with my eyes being capable of regenerating.
Also the boogie-woogie they do is very grotesque but it's not particularly scary for me either.