What was that at the end of Avengers: Endgame?

Endgame has come to destroy the Box Office Records, like many Marvel movies before it. But what was at the end credits? For the first time ever there are NO SPOILERS in this answer.

NOTHING.

THERE IS NOTHING this time.

Well, actually… you hear the clinking and clanging of Tony Stark making his armor in the cave from the first Iron Man, the movie that set all this off.