The Big One is a giant wave only seen in the episode SpongeBob SquarePants vs. The Big One.
If one wants to live after surfing The Big One, they must make at least one sacrifice. Objects sacrificed to The Big One in 2009 include:
The Big One is a large, blue wave of water with a face and tongue made of water. Once, it smiled and ate Patrick's surfboard.
In every year ending in -009 (e.g. AD 1009) during the alignment of the planets in the solar system, The Big One appears. The Big One will next appear in 3009, 1000 years after the previous one (2009).