On the morning of April 1, 1976, renowned English astronomer Patrick Moore got on the BBC radio station and made an astonishing announcement: Moore said that at exactly 9:47 a.m. that day, the planets of Jupiter and Pluto would align with the Earth.
Moore continued, saying that the combined gravitational pull of the two planets would cause a noticeable reduction in the strength of gravity on Earth. He called it the Jovian-Plutonian gravitational effect.
Sure enough, right after 9:47 a.m., the BBC was flooded with hundreds of calls from people claiming that they had personally experienced the phenomenon. One woman even said that she and her 11 friends were,
“wafted from their chairs and orbited gently around the room.”
The BBC revealed the hoax soon afterwards. Read more about the prank here.