Proof

Prove: Girls are evil

1. Girls need time and money
Girl = Time * Money

2. Time is money
Girl = Money * Money

3. Money is the root of all evil
Money = Evil ^ 1/2

4. Square both sides
Money ^ 2 = Evil

5. By transitive property
Girl = Evil

[urban dictionary definition of "girl"]

NOT MY DAUGHTER, YOU BITCH!!!