some of my favorites:

• 992: Good Friday coincided with the Feast of the Annunciation; this had long been believed to be the event that would bring forth the Antichrist, and thus the end-times events foretold in the book of Revelation. Records from Germany report that a new sun rose in the north and that as many as 3 suns and 3 moons were fighting. There does not appear to be independent verification of this remarkable event.
• 1000-JAN-1: Many Christians in Europe had predicted the end of the world on this date. As the date approached, Christian armies waged war against some of the Pagan countries in Northern Europe. The motivation was to convert them all to Christianity, by force if necessary, before Christ returned in the year 1000. Meanwhile, some Christians had given their possessions to the Church in anticipation of the end. Fortunately, the level of education was so low that many citizens were unaware of the year. They did not know enough to be afraid. Otherwise, the panic might have been far worse than it was. Unfortunately, when Jesus did not appear, the church did not return the gifts. Serious criticism of the Church followed. The Church reacted by exterminating some heretics. Agitation settled down quickly, as it later did in the year 2000.
• 1000-MAY: The body of Charlemagne was disinterred on Pentecost. A legend had arisen that an emperor would rise from his sleep to fight the Antichrist.
• 1284: Pope Innocent III computed this date by adding 666 years onto the date the Islam was founded.
• 1346 and later: The black plague spread across Europe, killing one third of the population. This was seen as the prelude to an immediate end of the world. Unfortunately, the Christians had previously killed a many of the cats, fearing that they might be familiars of Witches. The fewer the cats, the more the rats. It was the rat fleas that spread the black plague.
• 1524: Many astrologers predicted the imminent end of the world due to a world wide flood. They obviously had not read the Genesis story of the rainbow.
• 1844-OCT-22: When Jesus did not return, William Miller predicted this new date. In an event which is now called “The Great Disappointment,” many Christians sold their property and possessions, quit their jobs and prepared themselves for the second coming. Nothing happened; the day came and went without incident.
• 1919: Meteorologist Albert Porta predicted that the conjunction of 6 planets would generate a magnetic current that would cause the sun to explode and engulf the earth on DEC-17.