Rochdale caused a major FA Cup shock by beating Leeds United 2-0 to progress to the fourth round for the first time in 11 years.
Goals towards the end of each half from Scott Hogan and Ian Henderson secured the home side a place in the fourth round and Brian McDermott's Championship team could have few complaints after a poor performance.
Some 44 places divided the teams in the Football League at the start of play, but it quickly became evident that gulf would not be reflected on the pitch.
Joe Bunney's emphatic finish on seven minutes may have been ruled offside, but it set the tone for the game, with the home side keeping the visitors on the back foot.
Leeds were not entirely without threat in the first half and came into the game when Matt Smith rose above the home defence to guide Danny Pugh's cross goalward, Matt Lund clearing his firm header off the line.
But it was Rochdale who were asking most questions and when they broke upfield in the 16th minute, Peter Vincenti sent Hogan through on goal. Paddy Kenny narrowed the angle and blocked the striker's shot with his feet, Lee Peltier denying Henderson the chance to seize on the loose ball.
And as the first half drew to a close Rochdale looked to press home their dominance, Hogan setting up Henderson for an edge-of-the-area drive, Kenny again foiling the midfielder.
But there was no denying the hosts the goal they deserved and in time added on at the end of the first half Hogan drifted between Marius Zaliukas and Jason Pearce to meet Vincenti's cross and send a looping header over Kenny and into the net for his 11th goal of the season.
Leeds were brighter at the start of the second half, skipper Rudolph Austin curling a shot inches wide of Lillis' post and Smith's header hacked off the line by Rochdale striker Bunney.
Despite half chances for Ross McCormack and Pugh, Rochdale continued to look the team more likely to score the game's second goal.
Vincenti spurned a glorious chance to double their advantage in the 77th minute when Hogan teed him up 10 yards out, the former Aldershot man firing across the face of goal and wide.
Hogan himself went close minutes later with a cleverly improvised toe-poke towards goal, Kenny relieved to see it run wide. The goalkeeper then kept Leeds in the tie with a superb save to keep out Vincenti's effort.
The result was wrapped up in the 83rd minute when substitute Graham Cummins picked out Henderson and he sent a measured volley into the top corner of Kenny's goal.
Henderson was close to doubling his personal tally minutes later when he crashed a 25-yard shot on target, Kenny pushing his shot over the bar to save the visitors further embarrassment.