A day that will live long in the memory - the day Manchester City scored six at Old Trafford.
Roberto Mancini's men inflicted the Reds' worst home defeat since February 1955 on 23 October 2011, thrashing the champions in ruthless fashion to go five points clear at the top of the Premier League table.
The hosts hadn't been beaten on their own patch in over a year, but that record was brought to an abrupt halt by a ruthless display from City.
Mario Balotelli famously opened the scoring in the 22nd minute with a clinical low finish across goal before revealing his 'Why Always Me?' shirt.
And after United were reduced to ten men early in the second half when Jonny Evans hauled the Italian to the ground on the edge of the box, we stormed to a sensational victory.
The result not only emphatically handed City the local bragging rights, but would prove significant in the rapidly developing title race.
Roberto Mancini's men would claim our first Premier League crown on goal difference thanks to an unforgettable final day triumph over Queens Park Rangers.
The team we pipped to the post? None other than Manchester United.
11 years on, relive the Derby Demolition in full via the video above on City+...