I've always had kind of a sneaking suspicion that economics, especially high-finance kind of economics, is saddled with a lot of BS. I took an intro economics course in college (and did very well, I might add), and it seemed like some fairly non-controversial material. When you start talking about hedge funds though, a lot of that stuff seems to go out the window. If you're still reading, you might check out this article from James Galbraith about why so many economists (Paul Krugman and Brad DeLong being the most obvious exceptions) completely missed the latest financial cataclysm.
(h/t Nick Baumann)