Few dates sting quite like May 13, 2012, in the memory of any Manchester United supporter. It's the day a title that seemed destined for Old Trafford was snatched away in the most dramatic fashion imaginable—and the taunts from the stands at the Stadium of Light made sure no one would ever forget it.

Just ask Michael Carrick. When reminded of that afternoon recently, the current United head coach offered a tight nod and a forced smile. "Yes," he said quietly. "I can remember that. I have not forgotten it."

And how could he? It was the day Sergio Agüero's injury-time strike for Manchester City against QPR sealed the Premier League trophy in the most unforgettable finale the league has ever seen. One hundred and forty miles away, Carrick was still on the pitch at Sunderland, waiting for news that would never come.

United had arrived at the Stadium of Light knowing the equation was simple: win, and hope City slipped. For much of the afternoon, that hope felt real. Wayne Rooney's first-half goal gave Sir Alex Ferguson's side a 1-0 lead. Meanwhile, at the Etihad, QPR were holding firm. When the final whistle blew in the North East, United were top of the table—temporarily champions. The players and staff could only wait, hearts in mouths, for City's result to confirm their fate.

Then came the cruel twist. Edin Dzeko headed in a 92nd-minute equalizer for City. Seconds later, Agüero struck. The title was gone.

For United's players, the pain was immediate. But what made it worse? The soundtrack. As they walked over to applaud the traveling Red Army, the Sunderland supporters—despite their own team losing that day—erupted in sarcastic cheers and laughter. They reveled in United's heartbreak as if they had won the league themselves.

"We stayed out on the pitch because we had our result, but we knew it wasn't over at City," recalled one member of the United contingent from that day. "It was their last home game of the season, and there were still a lot of people in the stadium. I just remember the noise. There was sarcasm in the way they were singing. It wasn't over, but we thought we had done the job. Then the Sunderland fans got smart about it and started having a pop, which exploded into laughter because we had lost the league."

Sir Alex Ferguson was visibly downcast. "He was annoyed at the added time and the sarcasm. You knew he wouldn't forget. He could turn that into propaganda for next time. 'Remember this day. Remember Sunderland enjoyed the moment.'"

For fans and players alike, that memory remains raw. It's a reminder of how quickly football can flip from triumph to torment—and a lesson in why every match, every moment, matters. Wear your colors with pride, because you never know when the next twist is coming.