I was a subject in a college psychology experiment when I was an undergrad. The researcher said I would get some amount of $ for each new word in a sequence that I could correctly remember and repeat without error. I mentally made up a story and added each new word to the story. At the end they said that I remembered too many words, more than they had ever anticipated, it was too much $ for them to pay and gave me $5. Later I wondered whether the real experiment was about reacting to being tricked.