1. The unequivocal knowing that clicking anything marked "Click here for help" will lead to everything but what is relevant to your problem.
Susan: "I tried playing the .MP4 video you gave me, but the media player said something like 'Unrecognized format' and 'Click here for help.' I clicked help and it gave me 29 pages of the history of media players and a bunch of pop-ups for porn sites."
Mike: "Oh oh...the Faux Help Link. Forget it. I'll make a DVD..."