At least for me.

Riding home yesterday, I started getting pelted by swarming insects. About the time I figured out they were bees, one flew in my mouth.

It then stung me right on the roof of my mouth. Ouch.

Adds an element of novelty to the commute, spitting a bee out and then digging the stinger out of the roof of your mouth while clipping along at 25mph. I wasn't about to stop to do this; the bees were still swarming!