Shooting its venom through a harpoon-like dart, the venom of the cone shell contains the most powerful neurotoxin in the world. Did you know that it was this very venom that was used as the ingredient to shoot down the dinosaurs in Jurassic Park. (Okay it's a fictional book/film, but so what! It was imagined as THE ingredient to use against the mighty dinosaurs).
There is a local legend in Tahiti that once a tourist picked up a cone shell out of interest, ignorant to what it was. He stored it in the pocket of his shorts, and a short while later the snail shot its venom and the tourist died. Gee, thanks for making me feel so secure about Tahitian waters. Though apparently the snail is quite slow to come out of its shell, so as long as you stay away from them and don't touch them, you'll be right.
See the sea snail in action!