Jake Cooper's dramatic last-minute strike earned Millwall their first Sky Bet Championship win of the season, 2-1 over 10-man Blackpool at the Den.
Last man Callum Connolly pulled back Benik Afobe when he was through on goal after 14 minutes, leaving the Tangerines to play the majority of the game a man down.
However, Blackpool broke the deadlock against the run of play after the break thanks to some calamitous defending. Lions goalkeeper Bartosz Bialkowski collided with Murray Wallace on the edge of the box to give Shayne Lavery a simple 56th-minute tap-in.
Jed Wallace rifled a superb free-kick into the top corner from 25 yards seven minutes later to level the game and swing the momentum the hosts' way, before captain Cooper headed home from six yards to give Millwall all three points in the 90th minute.
Millwall striker Matt Smith posed an aerial threat all game and he found Afobe with a flick-on after 14 minutes, playing his team-mate through on goal before Connolly left the referee with little choice but to show the red card.
The hosts pinned Blackpool in their own half but rarely threatened and enjoyed clear few clear chances in the first period, with the visitors almost capitalising on a couple of defensive errors.
Afobe almost gave Millwall the lead in spectacular fashion in first-half stoppage time, but his acrobatic first-time volley was deflected narrowly wide.
The home side started the second half brightly and thought they had the lead four minutes after the break when George Saville's header ended up in the net, but the goal was disallowed for a foul in the box.
Scott Malone had a clear sight of goal in the 52nd minute after a neat backheel from Afobe played him through, but Marvin Ekpiteta prevented him from getting a shot away.
But it was Blackpool who took the lead five minutes later as Millwall's shaky defending finally cost them.
The impressive Josh Bowler carried the ball from his own half and played Lavery in behind. Bialkowski and Murray Wallace seemed to have done enough to deny the striker, but appeared to take each other out and allow Lavery to slot home.
The hosts hit back just after the hour mark with a superb free-kick from Jed Wallace, who left Chris Maxwell with no chance.
It was all Millwall in the closing stages and substitute George Evans nearly won it three minutes from time, only to be denied by a fantastic save by Maxwell from close range.
However, skipper Cooper secured the three points with a towering header, meeting Jed Wallace's corner with a powerful header that Maxwell was just unable to keep out.
What the managers said...
Millwall's Gary Rowett: "I did say to the players after, 'can I please not have any more games like that' because I was going to have a heart attack at one point. We don't make it easy. There's a little bit of nervousness around the place. It felt like today was almost like a must-win game.
"I think to a certain degree when Blackpool went down to 10 men... I'm not saying it made it harder but it just means they got behind the ball and looked to counter-attack, which they're actually really good at doing. Normally, I would jump up and down like a lunatic but I actually felt for Neil [Critchley] because I thought his team worked incredibly hard. I felt as though they had worked and deserved something out of the game."
Blackpool's Neil Critchley: "It was cruel, a cruel way to end the game for us. It's very hard to sum up how I'm feeling because on one hand I'm really proud of the performance that we gave, but on the other hand I feel completely devastated for the game to end in that way.
"To come here and play with 10 men for 75 minutes and play as well as we did, I felt we deserved something from the game - to be honest with you. It's hard to take. We've had a tough start of games but if we keep performing like we've done today, then we will win games."