All Australians have had their encounters with the dreaded bluebottle.
Well, (and if you did already know this I'm sorry) turns out bluebottles aren't jellyfish at all.
They're actually siphonophores. Although a lot of people consider them jellyfish because of their stinging tentacles, the bluebottle isn't a multicellular organism - it's a colony of tiny little creatures called zooids.
Now you know!
Soz if you already did.