Damn it

How the fuck did I get a an AB in Cost-Benefit Analysis? I got a high AB on the midterm and a really high A on the big semester long project. Did my group disown me on our evaluations. I thought doing the actual analysis of the numbers was a pretty important contribution to the project. Was my final bad, or at least not particularly good? I guess I don't really care what my grades are as long as I maintain the image of a smart man. But, I do care.

UPDATE: I didn't get an AB. That was an error in submission by my professor. It actually was an A.