I love how fandango have official Barbenheimer shirts that they are raffling off.
I am become death? Is that really what he said? How is that not grammatically incorrect?
It's present-perfect tense, an archaic tense found mostly in poetry and old texts. Oppenheimer was quoting old poetry when he spoke it, so that's why he kept the same tense.
Come on spidey, let's go fightey.
Green Goblin would totally say that!