I’ve been learning some about rabies and learned about rabies causing hydrophobia. This is just a theory, I’m not saying I know anything about this topic to be knowledgeable, but if we could get someone with rabies to not fear water, could they survive?
It also illustrates a funny bit of the logic of multicellular non-clonal creatures: the germ line is the species. The other 99.9…% of you is just a fancy delivery mechanism, so it makes sense to add something seemingly super impractical to the anatomy if it slightly helps the sex cells.