Melbourne coach Craig Bellamy believes complacency was behind the Storm's spectacular second-half collapse to allow Canberra to steal a 22-18 win at AAMI Park.
Leading 18-0 Melbourne looked like they would continue their march towards the minor premiership but Raiders prop Josh Papalii crashed over in the 76th minute for the shock win.
Not only did the Raiders claw back a huge deficit but they also had to overcome the sin-binning of two players in the first half which looked like it would prove the difference in the match.
"With the start we had and the Raiders had a couple of guys in the sin-bin ... I hate to say it but it looked like we were a little bit complacent to start the second half," Bellamy said.
"I'd hate to think that was the case but that's what it looked like to me.
"We started poorly with our completions (in the second half) and it never got much better."
Canberra five-eighth Jack Wighton was sin-binned in the third minute after he tackled Jahrome Hughes from an offside position as he tried to take a quick tap.
Two minutes later the Storm scored when centre Justin Olam collected a Cameron Munster kick.
Wighton had only been back two minutes when Canberra lock Joe Tapine was given a 10 minute break after lashing out at Nelson Asofa-Solomona in a scuffle.
Like clockwork, the Storm were in for their third try of the night, taking advantage of the overlap with Olam flicking a pass on to Josh Addo-Carr.
That soon became 18-0 through Suliasi Vunivalu and it looked like the competition frontrunners would romp home.
But third-placed Canberra showed why they are genuine premiership contenders with a spirited fightback.
Skipper Jarrod Croker was key, scoring a try either side of half-time, while hooker Josh Hodgson pulled off his 12th one-on-one strip of the season before Papalii's match-winner.
Canberra coach Ricky Stuart was disappointed in his team's first half discipline but delighted with the grit and composure they showed.
"We had to regroup at halftime and find a bit of composure and once we found a bit of rhythm in our footy and scored just after halftime it galvanised the team even more," Stuart said.
"There's no worries about belief, we know we're good enough but sometimes there's scenarios and passages of play that make it difficult.
"They showed everything out there that a lot of non-believers think we haven't got."
Tapine's night ended soon after halftime when he headed to the bench with a rib injury that he'd carried into the match.
Stuart said he was unsure if it would keep him out of next week's meeting with Manly.