Had a young friend several years ago, that when she did not have time to really fix her hair would wear her ball cap backwards to keep her hair in place and to hide it. My college student son always wears his hat backwards, it's the style.
As for me, only when driving the boat. When shooting, I'll raise my head just enough to hook the bill over the top of the scope, then back down to see through the scope. I've done it so much that I don't even realize I do it, it just happens. With 21 hours of sunlight, and most of it low on the horizon, I always have a hat on to keep the sun out of my eyes.