Well, that sort of illustrates why the test is wrong so often, but if you TRY to be bored and aggressive, you'll probably think too much ;)
The way they teach you to beat it is pretty simple. Before they ask the hard questions, they need to calibrate. They will ask you something easy to get a base truth response. Likewise, they will get a base lie response. You want your base lie response to go sky high so that nothing can ever match that. Bite your tongue. Tighten you ass. Whatever you like. Once you're past that, then strain yourself a little and answer all the questions like that. Just remember that you're not in the clear yet because you've handled the problem with the junk science handing out false positives, but don't forget the person across from you is not a scientist but a skilled interrogator. They can still ask all sorts of loaded questions. For example, have you ever done something personal during work time? The interrogator is much better at this game than you are and probably has more mental stamina than you do. That's why they say if you have a choice, don't take a polygraph - tell them you know how it works, and that it's a sham.