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Liverpool had been written off as title contenders time and time again throughout the 2008-09 season, and so they went to Old Trafford with little or no pressure on them.
Bar the three 1-0 wins there in the early 2000s—wins all curiously achieved through Danny Murphy goals—the Reds usually played the role of failing underdogs on their trips to United, and they looked as though they would do so again when Pepe Reina fouled Park Ji-Sung in the penalty area and Cristiano Ronaldo fired home the resultant spot kick.
Then Fernando Torres came alive.
The electric Spanish forward turned a routine long ball into a chance to torment Nemanja Vidic, and when he skipped away from the Serb the cool finish which produced Liverpool's equaliser was a given.
Steven Gerrard was then tripped by Patrice Evra in the area, and the Reds skipper beat Edwin van der Sar from the subsequent penalty kick. Liverpool were ahead, albeit scarcely believably.
Their superiority extended into the second half, and when a panicked Vidic hauled down Gerrard on the edge of the area he was sent off. Brazilian full-back Fabio Aurelio stepped up to the free-kick that followed and expertly curled it into the top corner.
Three-one was great but 4-1 was better, and, to cap a surreal day, it was Andrea Dossena—who had scored his first goal for the Reds in a 4-0 mauling of none other than Real Madrid only days earlier—who sauntered onto a long ball from Reina and elegantly lobbed van der Sar to send the travelling Kop into raptures.
It's arguable that Liverpool have ever had a greater result in the Premier League era.