Is it Possible to Pick Fly Shit out of Black Pepper?
The essense of the problem is one of detection. There is a whole area of signal processing called SIGNAL DETECTION THEORY. Its an interesting course. I took it from Doug Cochran as ASU.
So how do you pick fly shit out of black pepper? You can not do it. The joke infers that the 2 things are identical. Being indentical they can not be discerned. So stop worrying. You won't taste the difference.