THe shop where I used to work would send me to local bike races to provide neutral tech support. As I stood watching the riders go by I took a sip of my Gatorade just as a wasp was enjoying a sip from the mouth of the bottle. I got stung on my lip and half my face was swollen up like a grapefruit for the rest f the event.
Another time I was riding down a big hill on my road bike and a bee flew inside my half-zipped jersey and stung me right on my sternum.