My normal boilerplate is:

/usr/local/bin/perl
use strict;
use warnings;
use Data::Dumper;
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The first two pragmas because the help me by catching my typos (I am a two-fingered typist, and both fingers are on my left hand) and brain mis-firings. D::D is because I always need it in debugging something and it's a nuisance to remember whether I have already used it or not.

In the past three months I have started adding use Class::DBI to the list since I am doing a contract that uses an enormous set of Oracle database tables, and every time I turn around I find another table that needs its Object.