[Skybird]

Originally Posted by Konovalov

I'd take the jellyfish over the cone snail. We were taught at a young age not to pick them up as they fire a tiny harpoon like device out of the pointy end of the shell that can leave you feeling quite ill and in substantial pain.

It can even kill, they said in a docu. But a marvellous construction that weapon is.
I take the snail over the jellyfish, though. Some jellyfish can fire through a neoprene diving suit. Many are almost invisible in open water. Some even can orient themselves and engage and actively hunt a victim. Several are not only extremely painful, leaving terrible scars, but do kill within minutes. They had pictures of people that looked as if they had fallen into molten, hot metal, or something like that, and centimeter-deep acid wounds that made their limbs and body look like a moon surface. Beautiful, fascinating, but frightening creatures. Diving with sharks would make me less nervous.