In the name of science, entomologist Justin O. Schmidt has allowed himself to be stung by a multitude of insects in the order Hymenoptera, which includes bees, wasps, ants, and sawflies. He has used his data to create the Schmidt Sting Pain Index, which rates the relative pain of the stings on a scale from 1 (mild pain) to 4 (extreme pain). Schmidt’s original index, from 1983, rated only one example of pain level 4, the sting of the bullet ant. Schmidt described the sting as
… pure, intense, brilliant pain … like walking over flaming charcoal with a three-inch nail embedded in your heel.
| EarthSky
Some of the most painful stings come from tarantula hawk wasps, warrior wasps, and bullet ants.