Cognitive dissonance is that uncomfortable mental feeling you get when you have two conflicting ideas at the same time. I am feeling this right now. The conflict is between my desire to not spend too much money on anything that isn't a necessity and the fact that my LYS is having a HUGE 50% tent sale with all kinds of great yarns.
I am trying to convince myself that yarn is a necessity, and while in some ways it is, I know that in the overall grand scheme of things it isn't as I still have quite a stash full of yarn at home waiting to be used.
Sigh... cognitive dissonance... how I love/hate thee!