Kevin Johnson and Mathew Boley recalled the following
in a recent thread on sci.math:

                a = b
              a^2 = ab
          a^2-b^2 = ab-b^2
       (a+b)(a-b) = b(a-b)
              a+b = b
               2b = b
                2 = 1


                x = (Pi+3)/2
               2x = Pi+3
         2x(Pi-3) = (Pi+3)(Pi-3)
          2Pix-6x = Pi^2-9
             9-6x = Pi^2-2Pix
         9-6x+x^2 = Pi^2-2Pix+x^2
          (3-x)^2 = (Pi-x)^2
              3-x = Pi-x
               Pi = 3    


               -1 = -1
             -1/1 = -1/1
             -1/1 = 1/-1
       sqrt(-1/1) = sqrt(1/-1)
              i/1 = 1/i
                i = 1/i
            i * i = 1
               -1 = 1