Girls are evil?

Girls consume time and money    Girls=time*money
Time is money                Time=money
substitution principal        Girls=money*money=money^2
money is the root of all evil    money=sqrt(evil)
substitution principal        Girls=sqrt(evil)^2=evil
  Girls=Evil;  Q.E.D.

i = me

e = mc^2

i = m^2c^2

i = (cm)^2

i is 1 centimeter squared.