The scene, after the final credits have rolled, shows the Avengers going to town on a delicious Middle Eastern meal, making them all suddenly much more relatable.
It became a joke about getting some shawarma before getting back to work, inspired by both Whedon's apparent longtime love of shawarma and a particularly rough day of shooting.
The scene was filmed after the film first premiered but before it went into wide release when the cast probably felt just as tired and worn out as their superhero counterparts.