This reminded me of a mathematical equation that gave me a good laugh :)
Proof that girls are evil:
First, girls need time and money:
Girl = Time * Money
And we know that time is money:
Girl = Money * Money
We also know that money is the root of all evil:
Money = Evil ^ 1/2
Therefore:
Money ^ 2 = Evil
So we are forced to conclude that:
Girl = Evil