Every time Manchester United travels to Sunderland, there's an undeniable sense of déjà vu. The date May 13, 2012, is seared into Premier League folklore—not for a Red Devils triumph, but for the moment Sergio Agüero's injury-time strike snatched the title away and handed it to Manchester City.

United were on the pitch at the Stadium of Light that fateful afternoon, having done their part. Wayne Rooney's goal had secured the victory they needed. But as the final whistle blew, news of Agüero's dramatic winner rippled through the stadium. Instead of celebrating a title, United's players were forced to listen as Sunderland's fans cheered their heartbreak.

The Black Cats haven't let them forget it. Earlier this season, the Sunderland faithful taunted United at Old Trafford with chants about that very moment—a stark reminder that some wounds never fully heal.

United's traditional rivalries are well-known: Liverpool, Manchester City, Leeds. But Sunderland? That's a rivalry most Red Devils fans didn't even know existed—until May 2012 turned it into something personal.

Does facing Sunderland still stir those memories? What do you recall about that day? And how does their reaction—both then and now—make you feel as a United supporter? Share your thoughts below.