can reveal what kind of person you are. As a direct analogy to the half empty/full beer mug situation, your reaction on Wednesdays when you are on job reveals what kind of person you are.
An optimist is someone who is extremely happy on Wednesday as most of the week is gone and weekend seems all the more closer
A pessimist is one who is unhappy as there is still loads of time before the week ends
An idealist is someone for whom it really does not matter as he has a perfect work-life balance. Work on weekdays and life on weekends
A realist is someone who realizes every day is a Monday
PS: If anyone has that picture of that beer mug with the depiction of the various states, kindly mail it over to me :).. Too lazy to search for it now