All the Proof a guy needs.

Here is the PROOF that Girls are Evil!

First, let us start with the the fact that girls require a cross between time and money.
Girls = Time x Money

And as everyone knows, Time is Money.
Time = Money

So...
Girls = Money x Money = (Money)^2

And we also know that Money is the Root of all Evil.
Money = sqrt(Evil)

So...
Girls = (Money)^2 = (sqrt(Evil))^2

And therefore we must conclude the following:
Girls = Evil.

And there you have it folks.
Definitive proof that Girls are truly Evil.