Jellyfish are nature's gently drifting water balloons... Of DEATH.
You are walking down the beach in say, Australia. You have managed to avoid poisonous octopus by staying the fuck out of the water, you are living in a plastic box for your stay, so the spiders and other unholy terrors aren't getting to you, and it;s been 35,000 years since any carnivorous kangaroos prowled the beaches, so you're good there, too.
Then you accidentally step on something that looks like a wet plastic bag and has the consistency of Jell-O. You died on the way to the hospital. What the fuck?
Como estan, bitches? But seriously, folks. I'll kill you.