There is a story going round social media
January 4th 2014 – Planetary Alignment Decreases Gravity – Float For 5 minutes! #ZeroGDay
However the quote misses out the first sentence
During an interview on BBC Radio 2, on the morning of April 1, 1976, the British astronomer Patrick Moore announced that an extraordinary astronomical event was about to occur. At exactly 9:47 am, the planet Pluto would pass directly behind Jupiter, in relation to the Earth. This rare alignment would mean that the combined gravitational force of the two planets would exert a stronger tidal pull, temporarily counteracting the Earth’s own gravity and making people weigh less. Moore called this the Jovian-Plutonian Gravitational Effect.
They also ignored this;
Moore told listeners that they could experience the phenomenon by jumping in the air at the precise moment the alignment occurred. If they did so, he promised, they would experience a strange floating sensation.
At 9:47, Moore declared, “Jump now!” A minute passed, and then the BBC switchboard lit up with dozens of people calling in to report that the experiment had worked!
A Dutch woman from Utrecht said that she and her husband had floated around the room together. Another caller claimed she had been seated around a table with eleven friends and that all of them, including the table, had begun to ascend.
But not everyone was happy. One angry caller complained he had risen from the ground so rapidly that he hit his head on the ceiling, and he wanted compensation.Moore’s announcement was, of course, an April Fool’s Day joke. It became one of the most celebrated April Fool’s Day hoaxes of the late 20th century. However, it wasn’t just a random joke. Moore intended it as a spoof of a pseudoscientific astronomical theory that had recently been promoted in a book by John Gribbin and Stephen Plagemann called The Jupiter Effect.