I tend not to take notice of most of them, but the one I do believe is that man never went to the moon.
The US Government has fed so much bull***t to the general public, over the last few decades, that to quickly dismiss this only proves how effective propaganda and social brainwashing is.
Anyone prepared to approach the topic with an open mind should watch this documentary.
https://www.imdb.com/title/tt7794734/?ref_=fn_al_tt_1