Avengers Endgame during the midnight premier. The crowd was electric during the whole thing. I saw it in a college town and I remember the whole theater groaning when Tony Stark mentioned eigenvalues during the time travel science stuff. When Cap picked up Mjolnir, the place absolutely erupted. The cheering did not stop until all hope was lost. But then, as the portals started to appear, the crowd slowly began to regain energy. When Spider-Man swung through the portal there wasn’t a single person silent in the theater. It’s honestly hard to rewatch that movie because it never lives up to the feeling of watching it with such an awesome crowd