This brought me back to college and me learning about steganography. I wonder how many images are floating around with secret messages in them! Also reminds me of people who immortalized themselves by putting their initials or a favorite phrase in the header of a file format that got popular (like Mike did at Microsoft for .exe's; every exe header starts with MZ, which is really friggin cool)
Or the "Don't Steal MacOS.kext" that was used to prevent Hackintoshes from booting if it was messed with
Or the "Don't Steal MacOS.kext" that was used to prevent Hackintoshes from booting if it was messed with