Heading into Thursday night's match, the Cats had won 12 of their previous 14 games against the Swans, including five out of six in Sydney.
But the Swans turned the record books upside down, dominating their opponents from start to finish in a 22.16 (148) to 5.8 (38) triumph.
Across 215 matches between the teams dating back to 1897, it was the Swans' biggest ever win against Geelong.
"It's a bit hard to believe to be honest," midfielder Craig Bird said post game.
"But it was a great performance from the boys and I don’t think we had a bad player out there.
"Our last five weeks have been really good and we've been slowly building towards our best footy.
"We had the week off and were refreshed and it was good to come out like that after the bye.
"They're such a quality side, so we knew we were going to have to bring our pressure and our work rate, and I thought we did that the whole night.
"Everyone contributed, which was good."
By his own admission, Bird had made a slow start to 2014, with a calf injury early in the season forcing him to sit out two games.
But in a reflection of the team, he has slowly built his form, putting in one of the great performances of his 118-game career against the Cats.
He equalled his career high with 33 possessions, adding seven marks, six clearances, five tackles and a goal in a more-than-tidy night's work.
"My last five weeks have been a lot better," he said.
"I started the season pretty slow and had a few little niggles, but I've got on top of that now and starting to build and play a bit more through the midfield, which was good.
"I'm just happy to contribute to the team and thought the whole midfield was good."
While virtually every Swan contributed to the stunning result, as always there was plenty of attention on the club's vaunted forward line.
Kurt Tippett finished with five goals, with Lance Franklin (four) and Adam Goodes (three) also prominent, regularly finishing off the good work further up the ground.
"It's nice, isn't it?" Bird said, flashing a big grin.
"They played well again and 'Tippo' and 'Buddy' just presenting like they do gives us such good targets down there.
"As long as our midfield is getting on top, we're going to have plenty of opportunities to score goals.
"They really capitalised, which was good.”
