Have you ever really thought about your eyebrows? I mean, they're just a random bunch of hair above your eye. They don't serve any purpose.
But think of life without them. Eyebrows are essential in conveying emotion. How would you know if someone was surprised, or sad, or angry? You can always tell by looking at his/her eybrows.
There's a girl that I know that basically has no eyebrows. She's plucked them so much that they don't exist. Needless to say, she looks a little strange.
And why do we (especially girls) pluck our eyebrows? Why is having a unibrow so gross? Society is weird. Why do girls shave their legs, but not their arms? Why don't guys shave their legs? Why do guys have to have shorter hair than girls?