Slightly off topic...
When I am flying in business class or am near the front of economy and am not in the mood to read when I board, I watch the boarding passengers to pass the time.
I sometimes try and guess which will be the economy passengers who will get to the curtain/divider and then stop to recheck their ticket in the hope that despite everything they ARE in business class (presumably because they got an upgrade that no-one bothered to mention). There is a quite clear thought process that goes on. With some there is a subsequent bit of body language along the lines of "well I should be in business class but someone made a mistake and now I have to sit in economy with the proles but just be clear I really belong up the front"
I doubt CC have the time to observe this little ritual as much as I do though