Years ago I rented movies at Blockbuster Video and one time as I was leaving the store with my rental a young man with a clipboard approached me to conduct a survey about the customer service. Part of the conversation went like this:

Him: Do you feel you had to wait a long time at the checkout counter?

Me: No, it was all right.

Him: How long did you think it took?

Me: About 3 minutes.

Him: Well, I happen to have been standing here with a stopwatch taking the time you were in line, and it turns out you were actually in line for 3 minutes. Now that you know how long it actually took, how do you feel about the wait?

Me: I, um, feel the same as before.