I know this was just meant as a quick example for demonstration purposes, but you'd think you would want a return value from the subs, rather than a printed value. This allows a greater functionality of that method, such as placing the value in a scalar rather than printing it to the screen immediately. Meaning:

#!/usr/bin/perl -w
use strict;

my @objects = (
  {
    name => 'sheep',
    speak => sub { "baaah" }
  },
  {
    name => 'dog',
    speak => sub { "woof" }
    },
  {
    name => 'mouse',
    speak => sub { "squeak (almost silently)" }
  },
  {
    name => 'fish',
    speak => sub { ".oO()" }
  }
);

printf "a %s goes %s.\n", $_->{name}, $_->{speak}->()
  for @objects;

__END__
a sheep goes baaah.
a dog goes woof.
a mouse goes squeak (almost silently).
a fish goes .oO().
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(This is not even nitpicking or saying you did it a dumb way. I was just proud of my own observation on how to improve such a thing for wider use :P)