my ($one, $two, $three) = qw(1 2 3);   # works with warnings and stric
+tures
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Auto-vivication is the action by which a hash key that didn't previously exist gets created. This may or may not be intentional. Consider:

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

my %hash;

print "wow\n" if $hash{foo}{bar};
print $_, $/ for keys %hash;
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Cheers - L~R

Essentially, it's the fact that Perl will quietly create a space for something if you refer to it. Example:

my %x;

$x{foo} = 'bar';
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In that example, the memory for $x{foo} is auto-vivified. Contrast that with C++ and you'll see the benefit.