In episode 215 of Semantic Mastery's weekly Hump Day Hangouts, one participant asked if you can place iFrames into a JPEG image metadata area.
The exact question was:
Can I place iFrames into a JPEG image metadata area (comment field)? I am thinking of some type of infinite loop to Drive Album and back (or whatever else could/might work). Or maybe a number of images making up a silo stack.