They detest all life that moves faster.
So they have rather venomous thoughts towards us especially.
/kidding.
Certain species of marine snail have rather nasty barbed darts that they launch at fish.
The venom is rather brutal.
Oh great... now I am going to worry that every snail I see is just waiting for a chance to rush out and stab me with a venomous barb!
The horror... the horror...