How are you supposed to answer those pre-employment "personality" tests?

So I'm applying for jobs like a madman. It seems like most of the times I inquire in person, They tell me to apply online. I fill out the online applications and at the end of them, I am forced to take a pre- employment "personality test". Every time i take them, I'm somehow flagged and rejected. I'm not maladjusted, dangerous, or unstable. I'm just honest. So I'm asking YOU, my Yahoo Answers comrades, How am I supposed to answer those questionnaires? Do I try to lie and make myself an overly energetic,and over friendly eunuch? or do I keep telling the truth and just get lucky? Does anyone know hot to BS their way though these things?