Let's Talk About Avengers: Endgame. (SPOILER WARNING)

At first I was hesitant to start talking about Avengers: Endgame. Given the nature of the movie, it would be nearly impossible to discuss without ruining it for those who haven't seen it yet. A $1.2 Billion, including $350 million domestic box office, along with people discussing it at the college I work at has changed my opinion of how long to wait before a post like this. To help keep the spoiler talk and nods to the movie from spilling out into other threads, I offer this one to try and contain it. I would recommend using the spoiler text in the comments, since it's at least conceivable someone could accidentally stumble upon this thread.

DO NOT PROCEED IF YOU HAVE NOT SEEN THE MOVIE. THERE IS SO MUCH TO IT, YOU WILL REGRET GOING IN KNOWING WHAT IS COMING.

SPOILERS WARNING FOR THE COMMENT SECTION.