Why did people think the world was going to end on January 1st, 2000?
user
Well, I think a lot of that was over-exaggeration, and a good amount of it was some people predicting that computers would go nuts at midnight and make a lot of things bad for humanity.  But what’s interesting is that a lot of people who were worried about the world ending in 2000 believed in the idea that December 31st, 1999 would be a special day for a different reason, that on that date, the Maya calendar would complete a great cycle.
assistant
Wasn't the Mayan calendar also at the center of the 2012 world ending conspiracy?
user
Yes, there were many people who predicted that the world would end on December 21st, 2012.  It was quite a widespread belief that the world would end in that way.  People saw many, many reasons for why they thought this might happen.
assistant
Why did people think the world was going to end on January 1st, 2000?
user
Well, I think a lot of that was over-exaggeration, and a good amount of it was some people predicting that computers would go nuts at midnight and make a lot of things bad for humanity.  But what’s interesting is that a lot of people who were worried about the world ending in 2000 believed in the idea that December 31st, 1999 would be a special day for a different reason, that on that date, the Maya calendar would complete a great cycle.
assistant
Wasn't the Mayan calendar also at the center of the 2012 world ending conspiracy?
user
Yes, and I think those theories are an example of what people mean when they say something like “conspiracy theory.”  I guess the main idea here is that the people who predicted the end of the world thought there was a conspiracy.
assistant
Why did people think the world was going to end on January 1st, 2000?