Stonefish

Stonefish

"I'm just off for a splash in the lovely sea. Mmm this water is lovely! I'll wade in a bit deeper....AAAAAGAGGhhhImdead".
If you step on a stonefish, (which is practically fucking invisible, being as how it's made to look like a bit of rock) it'll inject its venom into you, at a dose relative to how hard you trod on it. It is the most venomous fish in the world. I'm quite fat AND clumsy and therefore find this fact alarming.
It has the voice of an angel and sings to you in a beautiful falsetto whilst showering you with gorgeous and thoughtful gifts and assuring you that you are THE most beautiful being that ever lived. Then it kills you DEAD the second you trip over it's fin. The spiteful, hateful bastard.