At some point in 2012 I found myself extremely bored with nothing but a phone and a laser printer so I did the obvious thing of printing out an obscure programming standard and attempting to implement it using Ideone.
The result is not remotely pretty or friendly to use, and doesn’t completely conform to the spec (data functions are hard) but it worked well enough for me to program a very basic cardgame in it and I’m pleased with the result.