I remember finding a comment in the first codebase I ever worked on professionally in my first ever job.

It read "This fixes a bug that hasn't happened yet".

It seemed really smart at first, but later I learned that the developer that added that code also had a pattern of appending spaces to the start and end of user input and comparing the length to 2 to determine whether the value was empty or not...

So I'm fairly sure "that hasn't happened yet" was probably more a case of "that I personally haven't introduced unnecessarily yet" :)