Eyebrows

I do believe in evolution but I have to admit, I'm conflicted. Take the eyebrow, I can't think of any evolutionary purpose for the eyebrow. They're too small to keep the forehead warm, too small for the comb-over thing balding people like to do. I mean I guess they could serve as temporary shelter for displaced pubic lice, but really the only reason I can think of for eyebrows is that you'd look pretty fucking stupid without them wouldn't you?