"Humans. They are not the cowering wretches we were promised. They stand. They are unruled and therefore they cannot be ruled. To challenge them is to court death."

If you read the comics especially the infinity gauntlet, Thanos is in love with a character named Death, which is why I believe the guy in the after credit is Thanos because of the unintended pun "....to court death"

hahaha get it? thats why he was smilling

I guess after watching it there would be a different branch of reality happening in this movie even though most of them were fixed by Captain America returning the said stones and hammer (how awkward is it to return the soul stone )

1) endgame reality- the current timeline, though the ending suggest that cap was always peggy's secret husband (prefer if cap just leave a note/shield and peace out in a new reality instead of muddying the time travel rule they established)

2) loki spinoff reality- since the past cannot be changed a new branch of reality were created when he escaped with the tessaract

3) No gotg reality - since Cap will return the stone to morag, quill will acquire the power stone but yet Thanos and Gamora are missing since they went to the endgame reality which kinda fuck up since it may cause Gotg were never formed