A Question for Your Advisors

The first in a recurring series in which I pose a question to the group of contributors and seek an answer from each within the week. The first question:

What, in your opinion, is the most significant mustache in history? And why?

I'll weigh in myself sometime this week, but in the meantime, I present the most fearsome moustache in history:

The story of the Menacing Mustache.