As pointed out in a followup, Real Perl Programmers prefer things to be visually distinct.
Larry WallI was raised a musician and I played classic music, violin, in orchestras and music comedy theaters, I have music running around in my head all the time, and if I hear music that's too interesting, I have to pay attention to it.
Larry Wall[Perl] gives you the STDERR filehandle so that your program can make snide comments off to the side while it transforms (or attempts to transform) your input into your output.
Larry Wall