The worst documentary you've ever saw ?

For me, it's The revelation of the pyramides. It does everything that shouldn't be done when making a documentary: fallacies, approximations, bad math, not relevant experts (and sometimes so-called experts who are experts of nothing at all), conspiracism, but above all, a completly fucked-up postulate: ancient building have been built by ancient aliens (called "builders") following a precise pattern to advert us of...something, it's not even precisely named.