I do this to embed shell commands at the beginning of short one-file C/C++ programs to execute when hitting an F key in my text editor. I usually put very basic compile-and-run commands. It's wrapped in #if and #endif which are comments in many shells. I end the commands with exit so it doesn't try to execute the code as commands.

This is why you should only use /* */ as your comment style.

Quite a time ago, my colleague accidentally committed a Youtube url to our Java codebase (middle-click accidental paste, no code review at that time). We had some laughing moments when we discovered it, as it was compelling evidence that he was watching videos during work, and even we knew what he was watching at that time.