I really have seen only one..

jellyfish in roughly 750 dives and 500 snorkel excursions in my diving history.. and it wasn't even on a dive.. it was off the deck of my overwater bungalow in Bora Bora in 2006.. Only saw it because it was sort of purplish in color..

One time in Mexico there were micro jellyfish in the surf off the beach.. Those stinging little &^$#^ were nailing everyone who stepped foot in the water..

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..