I vaguely remember reading a quote by Einstein related to a physics matter where he said something like "That would be double counting" (i.e. Don't do it). Does this sound familiar to anyone? What was he talking about? Note that this was not a wimsical quote. He was talking about a serious matter of physics. I am aware of the (alledged) Einstein quote "Not everything that counts can be counted, and not everything that can be counted counts." This is definitely not what I am talking about.