I came across this item recently. Back in '90 I used to work with an individual who was quite gullible. At some point, I wondered just how gullible the person was, so I altered a panel in the newspaper comic section and said, "Have you seen today's Family Circus!?! I Xeroxed it!"
The person's response was sincere. "Oh wow. I wonder why he would do that? Do you think he's having trouble at home?"
I later confessed what I did. I'm a softy at heart. Sort of.