Okay, the title is a bit of an exaggeration, but here's a kind of bizarre unexpected experience.
As I was out riding, I felt a prick on my skull, like a pin or needle. I moved the helmet around a bit, hoping it would go away. Then it begins stinging like a bee sting. I stop right away, pull off the helmet, and low and behold, I find a humble little European Earwig in the helmet. I squish it, rub my scalp a bit, take a drink of water, and continue on my way. The sting gradually goes away, but I can still feel it a bit.
However, earwigs are supposedly harmless. I never heard of one biting before. My wife thinks it was trying to burrow a hole in my head thinking it was soil (interesting thought ) I am certainly going to take a closer look at the inside of my helmet before putting it on next time.