I get goofy e-mails from some people with jokes, kitty-pix, crashing airplanes, or whatever. Some of them come with a box where you are supposed to see the photo of the kitty or whatever, and inside the box a small square containing a red X.
The box looks like the
on the SDMB, with the X square in the upper left-hand corner, and nothing else.
It has appeared on a number of e-mails from different sources. What would cause this?