On 30 October 1985, Atlético Madrid won the Supercopa de España despite losing to Barcelona.
The competition, played over two legs, matched Atlético, the previous season's Copa del Rey winners, against Barcelona, the reigning league champions. They met in Madrid for the first leg on 9 October, with Barcelona taking a 1-0 lead thanks to a 31st-minute goal from Paco Clos. But Atlético roared back with strikes from Mario Cabrera (40'), Miguel Ángel Ruiz (pictured) (52'), and Jorge da Silva (76') to end the day as 3-1 winners (video below).
Barcelona hosted the second leg at Camp Nou three weeks later and again took a 1-0 lead, this time with a goal from center back José Alexanko in the 32nd minute. But Atlético were content to defend their aggregate lead and Barça were unable to find another. So despite winning the second leg 1-0, they lost 3-2 on aggregate.
Since then, the two teams have met four more times in the Supercopa (1991, 1992, 1996, and 2013), with Barcelona winning all four.