Probably better for the jokes thread, but that last post by JAV.4k mad em think of a "The Far Side" comic.
The four personality types
(Four images with one person in each looking at a glass (~50% full) standing on a table)
First person:
The glass is half full
Second person:
The glass is half empty
Third person:
The glass is half fu...I mean, its empty... no, wait, what was the question, again?
Fourth person:
What the?! I ordered a cheeseburger