Harold Camping, an evangelical Christian, made multiple failed doomsday predictions, the most notable being the return of Christ in 1994 based on numerical codes found in the Bible.
The Y2K theory predicted that the world's computer systems would crash at the turn of the millennium due to a computer bug, but in reality, only a handful of incidents were reported.
Author Richard W. Noone predicted the world's final day would be May 5, 2000, but his theory was proven false when nothing happened.
Fear spread about the Large Hadron Collider creating black holes that could destroy Earth, leading to a safety report requirement before its operation.
The Mayan Apocalypse, predicted for December 21st, 2012, sparked panic and bizarre doomsday theories, but ultimately failed to materialize.