On September 4th, 1967, six silver saucer-shaped objects, emitting a strange, sour odor and loud, high-pitched beeping sounds, were discovered spread in an equidistant line across England.
Objects were found on the green of a golf course near Bromley, in South-east London, some fields scattered across southern England and upon a hill in Somerset. Each one was about 54in long, 30in wide and 20in deep, and weighed about 100 lbs.
Local responses varied - at least one of the objects was blown up by the British Army's bomb squad - and media interest increased as each new object was discovered. Eventually, though, all the objects were cracked open, to reveal battery-powered stereo speakers and a disgusting grey goo that proved to be a concoction of bread dough boiled at high temperatures. The apparent UFO landing was, categorically, a very elaborate hoax.
The ringleaders were Christopher Southall and Roger Palmer, 21 year old engineering students from the Ministry of Defence's Royal Aircraft Establishment at Farnborough in Hampshire. The students had constructed one object per month over about six months. Each one was molded from fiberglass laced with graphite.
The hoaxers later gave a press conference, during which they stated:
"We believe that flying saucers could land one day, so we landed our own to give the authorities some practice."
Their prank had been conceived part of the college's Rag Week - a traditional period of hi-jinks towards raising money for local charities - and by selling off the surviving saucers, they raised a donation of approximately £2000.