If there's any story on this list that best captures the message "be careful what you wish for," Smile Dog is it. The creepypasta deals with an image posted on an old Bulletin Board system back in 1992 called smile.jpg. Those who saw the image either disappeared or died, save for one Mary E., who the narrator goes to interview. What he eventually learns is that some things, even simple pictures, are better left as mysteries than dealing with the horrifying truth.

In case you were wondering, the story does come with an accompanying image, but you may not want to see it after reading the full story. Though, in the end, you may not have a choice.