New Math

When I was in high school a friend taught me that 2 + 2 = 5 can be "mathmatically proven." Of course I thought he was losing his mind... so he showed me. Based on the idea that whatever you do to one side of an equation, as long as you do it to the other side as well, they will remain equal, here it goes....

2 + 2 = 5
4 = 5 (multiply each side by 2)
8 = 10 (subtract 9 from each side)
-1 = 1 (square each side)
1 = 1

Pretty cool, eh?