Taken from another group chat - not my find, but I love it.

KillSwitchAn esoteric programming language built to break LLMs and coding agents.

https://www.theregister.com/ai-and-ml/2026/10/19/write-bot-resistant-code-with-killswitch-a-programming-language-designed-to-confuse-llms/5303919

https://killswitch-lang.org/