If you live in the Southwest, when you are out-and-about (doesn't matter if it's outdoors in nature or in the city) and you run into a bee that is staring you down and the closer you get to it, it starts to headbutt you in the chest…turn around and head the direction it is telling you.
Most people don't know this, but if you live in an area that has become endemic with killer bees and you follow just that one little rule, you'll probably save your own life.
Also would help to find shelter too if you have to.