I recently re-watched the movie Primer, which is completely under-appreciated IMHO, and this quote jumped out at me:

What's worse? Thinking that you're paranoid or knowing that you should be?

-- Aaron, Primer

AFAIK you can watch this movie free online. Just search for it. I might have to buy a copy though, as I do really like this movie. It actually makes you think and does not hold your hand, which is rare in movies today.