Haha so should you apparently. x)
I got the joke but it wasn't even funny to me... sorry(?). :T
Also, I do have to get around to finish to read the manga and seeing the "Brotherhood" series.
I wouldn't say it's a joke so much as a 'Wait. What!' moment that cedes to the eventual revelation of :the joke: and then you move on with your life.
(The original anime's ending kinda goes off the deep end with the Archinator, Dante, and Edward getting stuck in WWI Germany. Whereas the manga's and Brotherhood's ending turns into the badass power hour where almost everybody gets a moment of glory, including the nameless mooks.)