Heheh, thank you again Neejar/ Ebisu-san. I had never thought that the "half-empty" option would have any pros.
I had the impression that it was always about moody, grouchy people, insociable and lonesome. Now I find out that it actually has a good secret meaning and I'm a bit taken back.
But I also believe that it's a very worn-out question, as well. I mean, seriously. There has to be another way to see whether someone is optimistic or not.
Just my thoughts.