This is a NON-SPOILER but it will make you very curious! A video clip that's almost a year old shows how The Hulk pretty much spilled the end of Avengers: Infinity War.
Mark Ruffalo was doing a press tour with Don Cheadle on Good Morning America. The interviewer asked Ruffalo about any secrets from the then upcoming Thor movie.
To not spoil it for those that haven't seen the Avengers yet, Ruffalo let out a huge spoiler about Infinity War. Cheadle cuts Ruffalo a look and says "Dude!"
To his credit, Ruffalo and Cheadle play it off and the interview continues. In the aftermath of Infinity War, people are now talking about how obvious the spoiler leak was a full year ago.