My favorite HyperCard story is mostly well known: Myst was written entirely in it. HyperCard had some primitive reflection capabilities, where you could open

My favorite HyperCard story is mostly well known: Myst was written entirely in it. HyperCard had some primitive reflection capabilities, where you could open a different HyperCard file and read its scripts. I was pretty blown away when I used this truck to read in clear text the entire source code for Myst. Teenage me was pretty proud of myself.