In the book "How We Decide" by Jonah Lehrer, he talks about an experiment involving Strawberry (or, perhaps, grape) jelly.
They asked one group of students to rate 5 or 6 brands of jelly based on how "good" they thought they were. The results were very repeatable and the top brand was always top and the bottom jelly was always bottom.
THEN! They asked people to rate the jellies based on certain criteria. i.e.: Texture, flavour, Seeds/Seedless, Spreadability, etc... NOW the worst jellies were winning the votes!
It seems that when rationale is demanded to explain our emotional responses... that we, unable to explain them rationaly, change our emotions to fit that which we CAN explain rationaly. The worst part of this... is that we may never react emotionaly to that same thing again!