A bee flew into my jersey on a long fast descent a few years ago and I probably looked pretty silly flailing my arms, opening my jersey etc. trying to get it out while descending. It got its money's worth before I retired it.
Worst stings was playing golf.....walked on top of a yellow jackets nest in the woods wearing shorts while looking for a buddy's golf ball. Suckers flew up my shorts and had there way with me. I was running and coming out of my shorts at the same time.
Last weekend a rather large bug hit my glasses on a fast descent. It hit so hard it moved my glasses a bit and left a squish mark on the lens. Imagine what it might have done had I not been wearing sunglasses?!?!?