Okay, I'll describe the picture (or at least try to). It was a picture of a (supposingly) haunted painting showing these two very gloomy looking children staring at the viewer in a dark room. It made my skin crawl and made me feel really uncomfortable when I saw it.
After I looked at it, I read the rest of the description/story under it (I had started reading it and skipped a lot of it to look at the picture)... it said that some people experienced abnormal happenings or feelings just viewing the picture and not to use it as a wallpaper (who would want to though...) or display it around children.
Lesson: always finish reading a description before looking at anything...