Not as frightening as bee's or ants, but this little dude could put a hurting on ya.
I did have a run in with fire ants once. I had just moved to Florida, and had no idea what a fire ant was. I rented an old house when I first moved here, and the drive way was done in tile. I was changing the oil in my bike, and needed to lay on the ground to get the oil drain out. I noticed there were a few ants there between the tiles, but thought nothing of it. Needless to say when you lay on a fire ant mound hundreds/thousands come out in a big hurry. They were in my shirt, down my pants...........Got nailed a few dozen times before I could get out of my cloths. Glad nobody had a camera around.