Summer brings warm days, even in the early morning. As the mercury rises, the jersey zipper goes down.
Over the years I have encountered a whole spectrum of biting and stinging insects, and spiky-footed beetles. I've had the yellowjacket up the shorts, bees, wasps and hornets down the shirt, and various mites, midges and helicopters down the windpipe.
Generally when this happens I must grab the lower edge of my jersey or tee shirt and shake it to coax the miserable insect to the exit. In extreme cases I might have to execute an angry hornet that won't let bygones be bygones. Those will keep stinging in anger rather than try to escape. One way or another, I get them out eventually.
Commuting, I wear a bum bag strapped around my waist. This complicates the bug situation, because the route to freedom assisted by gravity no longer works. It's led to some funny scenes in which I clench my fist around an angry hornet while yanking upward on my shirt with the other hand, sometimes at 30 or 40 miles per hour on a descent.
This year seems especially buggy. I just zip the jersey and forgo the ventilation when the barrage gets too constant.
A wasp in the helmet vents can be pretty bad, too. Fortunately, the bandanna I wear is just enough to keep stingers from getting through all the way. The flow of air through the helmet vents guides the attacker to freedom soon enough. So far, anyway.