Whether it's the moon landing, a royal death or a world-changing terrorist attack, where there's a big story, there's a big conspiracy theory to go with it.
The same can definitely be said about the EU referendum - and as campaigns closed and polling stations opened on Thursday, the tension prompted all sorts of suspicions.
And most of them came from the Brexit side, in case that's a surprise.
Here are the three most popular ones...
1. Vote with a pen, because MI5 is waiting to rub out your pencil cross
You have to be pretty nervous to suspect that even once you've crossed the ballot paper box and slipped it in the crate, it could still be tampered with on the way to the count. But this was actually a top concern for voters.
The hashtags #UsePens and #pencilgate shot to the top of trending lists after Brexit voters started urging each other to take their own pens to the polling stations, for fear that sneaky MI5 agents could rub out and change pencil votes.
This was also a prominent worry during last year's General Election, but, well, think it through...
2. Allowing more last-minute voters means more votes for Remain
Ukip leader and fierce Leave campaigner Nigel Farage suggested that the Government's decision to extend the application deadline to register to vote could also be responsible for a tip in the Remain camp's favour.
The 48-hour extension due to technical issues with online registration earlier this month gave millions of extra people the chance to cast their vote, which he said "may be what tipped the balance" if Britain votes to stay in the EU.
He also went as far as to suggest that the tragic murder of Labour MP Jo Cox last week "might be part of it", but denied the event had cost him his vote.
But whatever the result and for whatever reason, Farage still vowed: "Win or lose this battle tonight, we will win this war. We will get our country back, we will get our independence back and we will get our borders back."
3. The bad weather is a ploy to stop people going out to vote
If there's one thing you will never get away with in Britain, it's blaming it on the weather. After a week of deluges and flash floods, the fresh downpours that hit parts of the country on Thursday shouldn't really have come as a surprise.
But still, a pretty big number of people suggested that disrupted travel and the closure of some polling stations due to flooding was another attempt by the Remain side to stop voters from casting their Brexit vote.
Psh. Rain? What rain?