Well, yes, if you are open to sleeping "together" and it ends up in print, well, it can cause more than an "error"... (:

Seriously though, $|++ only makes the currently selected output file handle non-buffering (STDOUT, by default). You can do the Perl4-ish thing (updated slightly to use my):

    {
        my $selected= select(LOG);
        $|++; # Unbuffer output to LOG
        select( $selected );
    }
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Or you can do:

    require IO::Handle;
    LOG->autoflush(1);
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which accomplishes the same thing.