“Assassin snails” are common in the aquarium trade because some snails reproduce really fast and can become a pest sorta taking over a tank (these include Malaysian trumpet snails, pond/bladder snails, and ramshorn snails)

So people get assassin snails to keep their numbers in check (first image is from a YouTube thumbnail talking about them, hence the caption and giant arrow 😅)

That elongated, streamlined shell made me assume this was a joke or hoax at first.

I must be high. I read that as cannabis snail. And I was thinking of a snail that crawls on your skin and causes a high effect