Long meeting with a coworker presenting a huge, complicated system to track changes to configuration files.

Basically, whenever someone needs to change a config file, this person is supposed to manually enter an entry to a changelog file, and the build system is supposed to give an error if the person forgets to update the changelog.

At the end of the 1 hour long presentation, I raise my hand and say: "we are already using git for our config files, look:

$ git log <filename>

here you can see the list of changes to the file. What you describe is already available, no need to reinvent it."

Long akward silence in the room.

The presenter: "okay, I will look into that. Any other questions?"

Haven't heard about that project since then.