Let’s say that, through whatever unlikely contrivances you wish to postulate, you find yourself face-to-face with your counterpart from another reality. The only difference between Earth-Prime and this world is that, on Earth-Prime, the Straight Dope is written by a real person named Cecil Adams, whose pen name is Ed Zotti. Thus your counterpart is identical to you in almost every way. No one else is aware of your doppleganger’s presence.
Do you and your counterpart
a) beome best buddies and use your shared talents to make your life better in a benevolent, non-evil-fashion;
b) become best buddies and immediately start brain-storming ways to use the situation for evil;
c) immediately engage in a battle to the death;
d) form a superficial alliance but immediately begin plotting one another’s downfall; or
e) something else?