From the page: "ialdini, Cacioppo, Bassett, and Miller (1978) asked students to participate in an experiment. 56% agreed, before being told that the experiment started at 7:00 AM. They then told the volunteers that the study was scheduled at 7:00 AM, and the volunteers could withdraw if they wished. None did so, and 95% turned up at the scheduled time (the Low-Ball group). When a control group was asked to participate and were told the unsocial timing of the experiment up front, only 24% agreed to particip"