#!/usr/bin/perl
use strict;

sub prefix_later {
   my ($just_once, $and_later) = @_;
   my $ct = 0;
   return sub {
      $and_later->(@_) if $ct++;
      $just_once->(@_);
   }
}

my $hi_mom = prefix_later(
   sub { print "You said: ", shift, "\n"; },
   sub { print "You've already said: ", shift, "!\n"; }
);

$hi_mom->("hi mom") for 1..3;