2. Peeing on a Jellyfish Sting
You’re far more likely to suffer a jellyfish sting than a shark bite, so here’s what you need to know:
First, don’t believe the rumors. Peeing on a stung bit of skin won’t do much to relieve suffering, and you’ll suffer some odd stares, too, doctors say.
“Urine has not been scientifically proven to help in jellyfish stings”, said Dr. Paul Auerbach, an emergency physician at Stanford University Hospital and an expert on jellyfish stings.
“Instead, vinegar is the best first treatment,” he said, when treating stings from North American jellyfish.
As Col. Potter would say Buffalo Biscuits! It may not be scientifically proven... but it works (from personal experience). You can always go back into the surf to wash off (if you dare).
Don't acquire your first aid information from Hollywood!
Best advice from this whole thread!
However... don't rule-out the usefulness of a tourniquet in the right situation. When needed, tourniquets SAVE LIVES and you will probably see an increase in their popularity in austere/remote medicine in years to come. Sure, pressure and shock management with a speedy trip to a surgeon is the preferred management of a major bleed… but the speedy trip to a surgeon isn’t always an option.
Disclaimer to all: DON’T DO ANYTHING YOU HAVEN’T BEEN TRAINED TO DO or ANYTHING THAT IS NOT WITHIN YOUR SCOPE OF PRACTICE!... 
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