Surprised this isn't already here, pretty popular at my college: I wish I was your derivative, so I could lie tangent to your curves.
That one is so bad, because it doesn't work. Presumably the derivative is used to calculate a tangent line. However, a tangent line touches the curve only at one point, unless the curve is totally flat. Either way, this is not what you want. You want fuckin' Taylor series approximations. (They won't work on curves that aren't smooth, but that's all right, because those are the curves you want to touch anyway.)
Aww yeah.
