An extraordinary second half has seen Brisbane become back-to-back premiers with a 47-point win against Geelong at the MCG.
A three-goal burst in the third quarter set the Lions a platform, before nine goals in the final term broke the game wide open and saw early celebrations.
Charlie Cameron and Hugh McCluggage both kicked four goals, while Zac Bailey nailed three from an extraordinary nine scoring shots.
Geelong had several struggling performers including Patrick Dangerfield and Jeremy Cameron, with the latter badly hurting his arm late in the second quarter.
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Pressure reigned in a tight first quarter with the first goal not coming until more than halfway through the period.
After gilt-edged misses from Zac Bailey and Sam De Koning, the first goal was kicked by Geelong's Ollie Dempsey from point-blank range.
Brisbane replied soon after through Kai Lohmann but then missed several chances to put scoreboard pressure - Bailey the biggest culprit with four behinds in the first quarter.
However, a superb running goal from Irish tagger Oisin Mullin saw the Cats hold a narrow three-point lead at quarter time.
Jack Bowes' early second quarter goal saw Geelong skip away to a nine-point lead, but three consecutive Lions goal, including a ripper from the boundary from Charlie Cameron saw Brisbane hit the front.
A monster 60m goal from Shannon Neale arrested Brisbane's momentum, before Levi Ashcroft ran around the man on the mark to goal from 50m in a team-lifting effort.
Just before half-time, Brad Close's set shot drew the scores level, with both teams entering the sheds deadlocked.
Jeremy Cameron - sporting an arm guard after a collision with Patrick Dangerfield prior to the break - got involved in the match early in the third quarter but missed a trademark set shot around the corner.
The Lions made the Coleman Medallist pay soon after, as Bailey soccered through from point-blank range to register his first goal from five scoring shots.
An amazing run-down tackle from Jeremy Cameron on Jaspa Fletcher resulted in an eventual goal to Max Holmes, before the Lions smalls broke the game open with three quick-goals.
Charlie Cameron struck twice from close range and then an inspirational goal from subbed-on Lachie Neale had the margin at 19 points at three-quarter-time.
Another Charlie Cameron goal early in the last quarter put one nail the Cats coffin, until a 50m penalty saw Mark Blicavs reduce the arrears to 21 points.
But goals to Cam Rayner, Will Ashcroft and Hugh McCluggage pushed the margin behind 40, before it continued to get more ugly from there.
Bailey kicked two more goals, while McCluggage added another couple to end up with four for the game.
Dempsey booted three goals as well in the last quarter to make it four for the game, but the Lions were too good, running out winners by 47 points.