ClipClip, 108 bytes, cracked by jimmy23013
"Hello, World!", he exclaimed at the top of his lungs, "What a beautiful day to be alive! Hello, World!"-13>
Everybody loves a short story.
The intended language was Pyth, which prints the first string, then chokes on one of the many type errors. With the offline interpreter, all errors go to STDERR, so they don't count as output.