TL;DR:<p>1) "Acoustic Kitty"[0] - not really a conspiracy theory. To be a conspiracy theory you need two things, at least - a conspiracy, and theorists. This was just a failed attempt to weaponize a cat.<p>2) That the government poisoned alcohol during the Prohibition. I've heard that this was confirmed, and debunked, so I don't know. Half points I guess.<p>3) MKUltra[1]. Yeah, but that's like the one conspiracy theory just about everyone who knows about conspiracy theory knows about.<p>4) "Is Area 51 fact or fiction?"... also not a conspiracy theory. No one doubted the existence of the facility (other than the government of course) so much as its official purpose.<p>So - not four conspiracy theories, and certainly not four <i>proven</i> conspiracy theories. You can do better, Hacker News.<p>[0]<a href="https://en.wikipedia.org/wiki/Acoustic_Kitty" rel="nofollow">https://en.wikipedia.org/wiki/Acoustic_Kitty</a><p>[1]<a href="https://en.wikipedia.org/wiki/Project_MKUltra" rel="nofollow">https://en.wikipedia.org/wiki/Project_MKUltra</a>