Excellent, choroba!

Building on your and GrandFather's suggestions, there's the following:

#!/usr/bin/perl
use warnings;
use strict;
use Lingua::EN::Tagger;

my %fragments;
my $p          = new Lingua::EN::Tagger;
my @adjectives = qw/nervous nutty obnoxious outrageous
  panicky repulsive scary selfish sore
  tense terrible testy thoughtless tired
  troubled upset uptight weary wicked worried/;
my @stems = (
    "It's been said that there were many",
    'Goldfish spoke with',
    'There were three',
    'People used to see 42',
    'There were quietly-roaming groups of'
);

while ( my $line = <DATA> ) {
    chomp $line;
    my $adjective = $adjectives[ int rand $#adjectives + 1 ];
    $line = $p->add_tags($line) =~ s/<nns>/$adjective /gr =~ s/<.+?>//
+gr;
    my @words = split / /, $line;
    for my $i ( 0 .. $#words - 1 ) {
        push @{ $fragments{ $words[$i] } },
          join ' ', @words[ 0 .. $i - 1, $i + 1 .. $#words ];
    }
}

print "Once upon a time...\n\n";

my @sentences;

for my $term ( keys %fragments ) {
    my $stem = $stems[ int rand $#stems + 1 ];
    push @sentences, "$stem $term "
      . ( join ' and ', @{ $fragments{$term} } ) . '.';
}

print join ' ', @sentences;

print "\n\nThe times have certainly changed.\n\nThe end.";

__DATA__
big businesses
fast red cars
big smart companies
fast light planes
fast animals
big bad wolves
small bad girls
bad growling bears
[download]

Sample output:

Once upon a time...

People used to see 42 small bad outrageous girls. There were three outrageous fast red cars and small bad girls. Goldfish spoke with light fast scary planes. There were three growling bad nervous bears. There were quietly-roaming groups of nervous big bad wolves and bad growling bears. There were three scary fast light planes. There were quietly-roaming groups of tense fast animals. Goldfish spoke with bad big nervous wolves and small outrageous girls and growling nervous bears. People used to see 42 big wicked businesses and smart selfish companies and bad nervous wolves. Goldfish spoke with smart big selfish companies. Goldfish spoke with red fast outrageous cars. Goldfish spoke with wicked big businesses. It's been said that there were many fast red outrageous cars and light scary planes and tense animals. There were quietly-roaming groups of selfish big smart companies.

The times have certainly changed.

The end.

An emerging Perl storyteller...