What to do (and not to do) for jellyfish stings

Although jellyfish stings aren't exactly a regular occurrence at the beach unfortunately they're not completely uncommon either, and knowing the best way to treat one could save you or some poor member of your family a lot of suffering. So what's the best remedy for the misery of a jellyfish attack? Vinegar. Straight up, in-your-kitchen-cabinet vinegar should stop the injection and spread of the poison and provide some relief for the pain.

On the flip side remedies you don't want to use (and that in some cases can even make things worse) include rinsing the area with fresh water, rubbing alcohol, ammonia, meat tenderizer, and (yuck) urine.