I also tried this:

    my $title = @{$INPUT->param("titles")}[5];
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Close. You have to make the list returned by $INPUT->param("titles") into an anonymous array to dereference it proper as an anonymous array with @{ }:

    my $title = @{[$INPUT->param("titles")]}[5];
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update: answering naikonta's comment below - I would subscript the list and posted this only as an explanation of why the OP's code didn't work :-)

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}