Ever park you bike at night for a few minutes or hours only to come back and find your helmet visor all fogged up? (Obviously this only applies to those of us who ride with full face helmets).
I think I finally figured out how to get around that problem. I just needed to hang my helmet so the evening dew couldn't fall directly on the visor.
I probably should be ashamed to admit this, but it only took me nine years with this bike to figure this out.