And Scarecrow's Brains....

 ...me as the Tin Man in a local production from 2009....

"The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side." -Scarecrow's version of the Pythagorean Theorem, from The Wizard of Oz

So...was this meant to be an intentional error, or simply a mistake by the scriptwriters? See the Poll on the left to cast your vote!