The much anticipated follow-up to Avengers: Infinity War looks like it will be the most serious, intense Marvel movie of them all. Avengers: Endgame, formerly known to fans as Avengers 4, got that title, as well as a poster and a trailer on Friday morning. The trailer shows the surviving Avengers in various states of disarray and sorrow. Tony Stark is adrift in space. Natasha and Steve seem to have a plan involving the past. Clint has become something other than Hawkeye. Thor and Bruce look distraught. Nothing looks optimistic. Twitter exploded with reactions to the Avengers: Endgame trailer. Some of the comments offer sharp and depressing observations about how these heroes deserve better, and some of them offer some levity. Here the very best reactions: Maddy tied the Avengers films neatly to Ariana Grande's "thank u, next" meme: one taught me love, one taught me patience, one taught me pain, and one taught me that marvel won’t give tony stark a break#AvengersEndGame pic.twitter...