It's funny ( sort of) that I had been thinking about those sort of incidents. Other group members have had it happen. There is a tiny piece of mesh in the front vent if the helmet, nothing on the sides. We were going quite fast at the time and I felt it hit my head I sude the helmet and stung me almost simultaneously, I did utter the F word and scrambled to unclip my lid quickly to the amusement of those behind me. Blo@dy thing had already made its escape before I could get it off. Fun cycling is good, it leads to more cycling!