To show students that introspection has its limits, show this entertaining 4 min video on choice blindness.
If that link does not work, these are passable substitutes: You will just need to emphasize that people generated reasons to justify their "choice."
To get students to look at the problem from a historical perspective, you could assign the following classics:
Ericcson, A. & Simon, H. A. (1980). Verbal reports as data.
Psychological Review, 87, 215-251.
Nisbett, R. E. & Wilson, T. D. (1977). Telling more than we can
know: Verbal reports on mental process. Psychological
Review, 84, 231-259.
Webb, E. J., Campbell, D. T., Schwartz, R. D., & Seechrist, L.
(1981). Unobtrusive measures: Nonreactive research in
the social sciences. Chicago: Rand McNally.
The following videos will also help students understand the limitations of self-report:
- Malcolm Gladwell's presentation on how experimental data are different from and better than self-report data--and how this has changed what we eat.
- A different Malcolm Gladwell presentation on questions raised about trusting self-report from furniture makers, from the Coke vs. Pepsi challenge, and from Timothy Wilson's work.
- Dan Gilbert's presentation on how our predictions about how we will feel ("affective forecasting") are inaccurate.
- Barry Schwartz's presentation on how we think more choices will make us happier but we are wrong--a phenomenon he calls the paradox of choice