As Arsenal's beleaguered troops went into the away dressing room at the Madejski Stadium four goals down on Tuesday night, Twitter was chock full of Gunners fans bemoaning their lacklustre side, and streams of disgusted supporters were making their way home.
How they wish they had stayed.
Nobody expected the North London side to come out in the second half of the League Cup fourth round tie with Reading and score four goals to bring the game to extra time. The odds on the Gunners then winning the incredible match 7-5 must have been slim to none.
In honour of one of the greatest comebacks of all time, here are five more sides who turned it around against all odds...