Howdy,
  Sounds fun! This is actually one place where not using strict 'refs' may make your code more maintainable. *ducks*

This was my take:

#!/usr/bin/perl

use warnings;
use strict;
$|++;

use vars qw( $AUTOLOAD $running );
$running = 1;

while ($running) {
  my $input = <>;
  my ($action, @args) = split ' ', $input; # probably not robust enoug
+h
  $action = lc( $action );
  no strict 'refs';
  &$action( @args ); # dispatch based upon action
}

sub go
{
  my @args = @_;
  print "You go @args\n";
}

sub quit
{
  my @args = @_;
  $running--;
  print "Thanks for playing\n";
}

sub AUTOLOAD # catches calls to non-existent methods
{
  my @args = @_;
  my ($method) = $AUTOLOAD =~ m/::(:?\w+)$/;
  print "I don't understand $method @args\n";
}
[download]

My session with this looked like:

Go west young man
You go west young man
Bob Ross is amazing
I don't understand bob Ross is amazing
quit
Thanks for playing

Of course, anything worth its salt would understand that Bob Ross was the man :-)

TIMTOWTDI,
-- dug