Hmmm, lurkingdirk, I don't mean to rain on your parade, but....two of your pics don't show eyebrow(s) but traditional "face paint/make-up" and the third picture is, well, a puppet. So I'd say BlueBalls takes the lead with... that...ehm... woman (?) criminally neglecting her looks...
Aaah whatever, Bert's monobrow is epic, puppet or not. I'd call it even.
But speaking of epic unibrows on puppets:
behold Nepomuk!