So you think your having a bad day. Read this article and compare his day with yours.

LOL I've read that one before... I can't imagine a Jellyfish in the arse but I've had one on the tongue and throat... not too fun.
I was 12, my father and I were out for our final certification dive. We were anchored above Black Bart on the gorgeous waters of the gulf near Panama City Beach.
I was eager to get in and the very first to get fully suited up. I was sitting on the boat's starboard side and made a request to the owner, instructor and my father for permission to execute a Navy Seal combat entry. They all looked around and shrugged and gestured sure, I guess, why not, I dunno. So with that I crossed my arms, flexed my legs held a deep breathe and took the plunge.
When I hit it cam very clear to me had done something wrong. (The rest of this ordeal probably in reality took 20 seconds but felt like 5 minutes.) My mask had came completely off attempting to take hair, my nose and eyebrows with it. My regulator (air supply) was ripped violently from my mouth, and the air had been about knocked out of me. I had to much pride to surface gasping for air.
In class my instructor really harped on not panicking. So I calmly searched grabbed my mask placed it on my face and cleared the water out. I was about 15 feet down and sinking. I rolled to the right and my saw my regulator line, running short on breath from the impact and from clearing my mask I was more than eager to shoot fresh O2 into my lungs.
I hit the purge valve a few inches from my mouth, I instantly felt a little air followed by a horrible punching sensation to the tongue over and over. I jetted for the surface screams muffled until I spit what turned out to be a jellyfish out. I franticly came on the boat unable to speak anything but slurred grunts. I used meat tenderizer rather than any alternative remedies I'd heard about for a jellyfish sting. One of the guys actually took a fish gutting tool to my tongue to relieve pressure, but I don't think it helped a whole lot. About 45 minutes later I went in (via the traditional style) to complete the dive. When I reached for my air line I swiped (with the mouth piece) a jelly fish and forced it into my mouth.
Pride went before the fall that day.