Cone Snail
Cone snails aren’t the type of snail you want to cup in your hand and allow to crawl across your fingers. Those who have been foolish enough to allow this were welcomed with the stinging of this creature’s tooth, which releases a diaphragm paralyzing toxin. Since cone snails are found roaming around on surfaces in the ocean, divers who have an unfortunate meet and greet with these snails typically drown and die.