Do not allow a bee into your helmet. I just got stung on the ear. I wear an open faced helmet with the padded leather ear covers, sort of police style. Damn it hurts and spreading to my jaw now. The little bugger had to fly into a 1/2 inch space beside my sunglasses in order to do it. I figure he did it on purpose and I was specifically targeted although I don't know why. At least it was only a bee and not a wasp. When I inspected at home I found the stinger and poison sac still attached. I had a wasp go down my shirt about 40 years ago so, in terms of averages, I did okay. The key to survival is to maintain complete composure and control. Anyway, best to avoid stinging insects if possible.