Yep, I can not believe it either. No cause Johnny Depp but because a man is wearing nail polish. But this remind me that men where the first ones to paint their nails. In 3000 bc on the Egyptian and Romans culture military commanders stain their nails and lips in matching colors before important battles. Yes for battle no for cosmetic or beautifying purposes. So why is so weird for us that men use nail polish in this times since it was their idea from the beginning.
Nail polish is very related to men. Is made some of the same components from car paint (and they love cars), the creator of the first nail polish was Charles Revson (Owner of Revlon brand), the creator of French manicures was Jeff Pink (I love Pink), come one again, why is so weird for us seen a men wearing nail polish.
There you have it. It look cool, it looks manly and messy just like must of men.
From:
http://www.refinery29.com/johnny-depp-accessories