Its part of our culture to predict the end of the world in our lifetime!! Just look at a few examples from history, the "end of world" preachers caused absolute chaos and mass hysteria in Christian Europe around the year 1000 :
AD 247, Christian prophets declare that the persecutions by the Romans are a sign of the impending return of Jesus.
AD 365, Hilary of Poitiers predicted the world would end in 365.
AD 380, The Donatists, a North African Christian sect, predicted the world would end in 380.
AD 387 St. Ambrose, Bishop of Milan, identified the Goths with Ezekial's Gog. The Goths had just destroyed the Imperial army at Adrianople, prompting Ambrose to say, "...the end of the world is coming upon us."
AD 300 St. Martin, Bishop of Tours: "Non est dubium, quin antichristus...There is no doubt that the Antichrist has already been born. Firmly established already in his early years, he will, after reaching maturity, achieve supreme power."
AD 410 When Rome was sacked, some proclaimed, (as reported by St. Augustine of Hippo) "Behold, from Adam all the years have passed, and behold, the 6,000 years are completed." This alludes to the Great Week theory, held by many millennialists, that the God-alloted time of man on earth was 6,000 years, to be followed by a thousand years of peace under the earthly reign of Christ.
AD 500 At the mid-fifth century, Vandal invasions recalled calculations that the world would end in the year 500, 6000 years after Creation, and spurred new calculations to show that the name of the Vandal king Genseric represented 666: the number of the Beast.
AD 500 Hippolytus of Rome, a third-century theologian supported the oft-accepted (for the day) view of the end of the world occuring sometime around the year AD 500. He used a mass of scriptural evidence, including the dimensions of the ark of the covenant.
AD 500 Roman theologian Sextus Julius Africanus (ca. 160-240) predicted the second coming of Jesus in the year 500.
AD 500 The theologian Irenaeus predicted the second coming of Jesus in the year 500.
AD 590 Bishop Gregory of Tours, who died in AD 594, calculated the Time of the End for sometime between 799 and 806.
AD 793 Elipand, bishop of Toledo, accused Beatus, abbot of Liebana, of having prophesied the end of the world. Beatus made the prediction on Easter Eve, predicting the end of the world that very night, spraking a riot.
AD 800 Sextus Julius Africanus predicted the second coming of Jesus in the year 800.
AD 800 Beatus of LiƩbana, not having learned anything from the riot he started in 793, wrote in his Commentary on the Apocalypse that the world would end in the year 800 at the latest.
AD 806 Bishop Gregory of Tours predicted the world would end between 799 and 806.
Ad 848 The Christian prophetess Thiota predicted the world would end in 848.
AD 992 A rumour that the end would come when the feast of the Annunciation coincided with Good Friday. This happened in 992, when Easter fell on March 22, and eager calculators established that the world would end before three years had passed.
AD 1000 Christian authority all over the known world predicted the second coming in the year 1000.
AD 1033 When the world did not end in 1000, the same Christian authorities claimed they had forgotten to add in the length of Jesus' life and revised the prediction to 1033. The writings of the Burgundian monk Radulfus Glaber described a rash of mass hysterias during the period from 1000-1033.
. . . . and these go on and on, right up until the present day.
BTW I guess after 2012 has passed the next "big one" will be 2033, the 2000 year anniversary of Jesus' death.