Where I work, I keep a 'lab.pl' on every server/workstation that I come in contact with. It's basic make up is:

#!/usr/bin/perl -w
use diagnostics;
use strict;
$|++;

use Data::Dumper;

__END__
[download]

If a co-worker asks me a coding question, I can mock up a demonstration at a terminal and teach them what I'm doing as I code. This is very handy.

And if there are errors, I just talk through them till I have a working model, then I can mail them my file and they have an example to keep.

--
Casey
   I am a superhero.