I heard of one where birds are really some kind of biological robot the government uses to spy on us. “Birds aren’t real” it’s called. But, there have been “conspiracy theories” that have been proven true. For decades it’s been said that the government released lymes disease which has recently come out as true (google it), the JFK thing (any intelligent person can tell there was more then one shooter), government finally admitted to ufos being real after saying it was a “conspiracy theory” for 70 years, Bobby Kennedy also obviously had a second gunman and his own son wants his case reopened, government admitted to mind control experiments using lsd on inmates and people against their will and knowledge, etc., etc. My point is, just because the government or the majority of sheeple tell you something is a “conspiracy theory” doesn’t mean it really is. Think for yourself and do research. Don’t blindly believe what you’re told. Though most of those listed by op are ridiculous.