you can use it to send "for your eyes only" stuff. example: send an image to Mary and tell her not to send it to anyone else. She inevitably sends it to someon

you can use it to send "for your eyes only" stuff. example: send an image to Mary and tell her not to send it to anyone else. She inevitably sends it to someone else, but the image magically changes to another image that says a message, maybe it says "DAMN IT MARY, I SAID DON'T SEND IT TO ANYONE ELSE!"