Sample (and simple) postscript error file

I need a small postscript file that causes a printer error to test an application I'm writing to help manage printer queues. Rather than experiment with various combinations of postscript code to create one, I thought I'd ask if anyone has such a sample available. I've googled to no avail and am turning to the ServerFault community as a last resort before I begin experimenting.

Also, it needs to error in such a way as to cause a printer error -- not be silently ignored.

Here is a minimal PostScript file that SHOULD cause an error message '/undefined in SHOW_' or some such:

%!
200 500 moveto
/Helvetica findfont 36 scalefont setfont
(Hello, world!) SHOW_
showpage

Here is a PostScript file that should NOT cause an error (since the case sensitivity error of above file is corrected):

%!
200 500 moveto
/Helvetica findfont 36 scalefont setfont
(Hello, world!) show
showpage