A £4.5m stunt to convince three members of the public they were orbiting the Earth in a Russian spacecraft...when they were actually in a state-of-the-art Hollywood simulator for five days.
Filmed by Channel 4 in 2005 and hosted by Johnny Vaughan, Space Cadets claimed to be the biggest and most expensive prank in television history.
Except for the Actual fake moon landing itself, which is still the biggest and most expensive prank played on all of humanity.