It's tough to narrow it down to one scene, but here are some in no particular order that are burned into my brain: 1. Thanos: "I am inevitable." Stark: I...am...IRON MAN." 2. Cap wielding Mjölnir 3. Stark reuniting with Spiderman 4. Professor Hulk in 2012 after Cap says perhaps he should smash some things along the way: "It seems gratuitous, but whatever" then starts smashing things unenthusiastically. 5. Thor talking shit to the kid playing video games 6. Stark's death 7. Cap on the elevator when he's taking Loki's scepter and says, "Hail Hydra." Fuck man. So many incredible moments in the film.