On this day in 1977: Pink Floyd’s tenth studio album ‘Animals’ entered the UK charts at No.2. The sleeve concept was that of Roger Waters, who lived at the time near Clapham Common, and regularly drove past Battersea Power Station. A view of the imposing but disused former power station building was chosen for the cover image, complete with massive inflatable pig suspended between two of the towers.

The pig came untethethered and disappeared from sight where it was spotted by airline pilots at thirty thousand feet in the air. Flights at Heathrow Airport were cancelled as the huge inflatable pig flew through the path of aircraft, eastwards from Britain and out over the English Channel, finally landing on a rural farm in Kent that night.

https://www.youtube.com/watch?v=3GE-sfEbJ7I