I don't know that I ever had a bug in my helmet but I did manage to almost choke on one earlier this spring. however I can see it happening. try a hairnet or a onion bag over your helmet
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk