When you install RealPlayer, you have the option to receive spam by turning certain checkboxes on. The install program shows you four checkboxes, all unchecked (meaning you don't want spam), but the bottom four checkboxes (which you must scroll down to see) are pre-checked, meaning you'll get spam unless you turn them off.
The default unchecked boxes that are visible at the outset clearly lead the user to believe that ALL of the boxes are unchecked, and the avg customer probably won't think to scroll all the way down and uncheck these boxes. Which means that by clicking "next" when confonted with the first four unchecked boxes, the user unwittingly elects to receive sports, entertainment, music and new service announcements.
