For me, it's the intro cinematic to Final Fantasy XIV: A Realm Reborn. I never played the defunct 1.0 version of FFXIV, whose final moments are what this cinematic shows if you aren't aware, but there is something about seeing all the bloodshed and destruction while Answers plays in the background that makes an incredibly strong melancholy mood in the trailer and really sells the feeling of this being an end of an era for Final Fantasy XIV, both in-game and in real life. I have to imagine that it's only more poignant if you were one of the people there for the end of 1.0.

This is an image which contains spoilers for the entirety of The Last of Us 2, proceed at your own risk

A major cutscene also got leaked. This is a link to that cutscene. Proceed at your own risk.

It seems that QA testers were promised bonuses when the game was going to launch, but with the indefinite delays, those bonuses obviously got pushed back. Considering that the menu language of the cutscene is Portuguese (I think), I wouldn't be surprised if someone from South America, where QA probably got outsourced to (Naughty Dog is infamous for their bad work culture) was depending on that bonus, especially with the covid situation.

I don't know how to handle this situation discussion-wise right now. If you want to spoil yourself for whatever reason (maybe not planning on buying the game, whatever) and discuss the plot of TLOU2, please mark everything as spoilers (you can use sections to hide sensitive info). Everyone else, tread lightly.

EDIT: Actually, a lot more cutscene got leaked, here's the links in the section: