This is unfortunately the time of year when bee and wasp stings are more likely to happen. If you get stung by one of these insects, you can relieve the pain with common household supplies.
Photo by brokinhrt2
Ammonia for a bee sting; vinegar for a wasp sting.
Rules of Thumb supplies this tip via Dr Bill Grierson, professor emeritus at University of Florida. It's well-established advice (in fact, here's an article from 1968 recommending ammonia for all stings) that supposedly works because the insect venom is acidic while ammonia is alkaline.
Caring for an Insect Sting [Rules of Thumb]