In true Bob fashion, what I mean is not exactly what I said. By 'recursive batch file' what I meant was...

I couldn't remember how/if I could make a batch file beep, so I created a batch file on the desktop and in it I made one line:

beep

I saved the batch file and called it beep.bat.

Then I double clicked it.

CPU usage, of course pegged at 100% and stayed there...