#1 Reason why I don't try to do anything fancy with my eyebrows:

There's always that ONE hair that eludes you, and in the process of trying to get that ONE little hair, you end up pulling hair after hair, and soon, you can feel a little breeze, because that ONE little hair has caused you to pull a few too many surrounding hairs, and there appears to be a light spot in your left brow because of said hair being missing.

Oh well.

It'll grow back.