@layman,
I conducted a psychological/sociological "experiment" once for a course I was taking. My hypothesis was that cheese-eaters are prolific in society, and I proved it to be correct.
I did a "poll," calling people randomly on the phone. In a pleasant, friendly tone, I told them I had a job taking this poll and asked them if they would do me a favor and answer "a couple of brief questions" about their consumer habits. Almost everyone said yes. If they claimed they were busy, or something like that, I assured them that it would only take "a few seconds" and that it would really help me out.
Once they said "yes" I started talking in the most boring monotone imaginable and read from a list of questions a mile long in a stilted fashion. "Do you buy Bunny bread? Do you buy Duracell batteries," etc.
I counted the number of questions they answered before objecting that it was becoming burdensome. When they did, I just said "Just a couple more questions, OK, and I'll be finished." Then I would start reading from my endless list again. I did that over and over.
Then, to make it all "scientific" I later did some "statistical analysis" involving "confidence levels," and reported my findings, which were:
"Buncha cheese-eaters out there, sho nuff."
On average, they spent over 30 minutes (notwithstanding recurrent resistance) listening to that crap and answered an average of 78 questions, not "just a couple.'