Navy Blue Socks or Black Socks?

Am I the only person who can't tell the difference between navy blue socks and black socks? When I'm at the store sometimes I just can't tell by looking, I have to look at the tag to find out the color. Of course I can usually tell the difference really fast when I am at work wearing black pants and notice my socks are navy blue don't match. Then I feel really cool. But that's what I get for getting ready in the dark I guess.