"Your eyes are as brown
As the Night's, looking down
On waters that sleep
With the moon in their deep" . . .
--Madison Julius Cawein, "If I Were Her Lover"
When you look into brown eyes it's like falling into soft, deep, rich, Belgian chocolate. Writers often say in books that when they look into someone's eyes they feel like they're falling into them. When you look into brown/blackish eyes, you're falling into darkness, you're so happy you can't see. But when you fall into blue eyes, what are you falling into? The ocean? You can't fall into the ocean, or you will drown, silly. And when you drown, you die.
Conclusion: blue eyes kill. Brown eyes kick ASS!