Before the release of the film, the Russo brothers sent out a plea to fans not to ruin the film for others who might not have seen it yet, issuing an online spoiler ban that would remain in place until Monday 6 May - by which time, of course, any self-respecting Marvel fan will have managed to get down to their nearest multiplex.
The directors of the film sent out a polite reminder on Thursday that the ban would soon be lifted, writing: "If you haven't seen Endgame yet, see it this weekend. The spoiler ban lifts on Monday!"
If you haven't seen Endgame yet, see it this weekend. The spoiler ban lifts on Monday!
Check out @GMA for the full video... pic.twitter.com/gGrvUgLL6k
- Russo Brothers (@Russo_Brothers) May 2, 2019
But it's not just the Russos that are tweeting about the change in spoiler policy come Monday.
Chris Evans - aka Captain America - as also piped up with a bit of a cheeky message.
No one involved in the film was supposed to have filmed anything on set, which we'd imagine was a precaution to avoid anyone leaking information.
But Evans has responded to the Russo brothers' tweet, asking: "Does that mean I can start posting set videos on Monday?"
Does that mean I can start posting set videos on Monday? https://t.co/X9c946pFW6
- Chris Evans (@ChrisEvans) May 2, 2019
We don't know if Evans is merely bluffing to wind them up, or if he does actually have some footage from the set. Here's hoping it's the latter, eh?
Plus, it could simply be a case of giving into peer pressure, as Chris Pratt's already broken the rules by sharing a behind-the-scenes clip on social media.
He wrote: "I remember being blown away in this moment on the @avengers set. Nobody was allowed to film anything on their phones. I said screw it. No rule was going to stop me from seizing this once in a lifetime opportunity to capture this collection of stars, a group that likely will never be in the same room again. We are so blessed."
Along with the strict ban on cast and crew sharing anything from the film's production, the Russo brothers also asked viewers to be considerate to fellow fans.
In an open letter issued ahead of the film's release, they wrote: "To the greatest fans in the world. This is it. This is the end. The end of an unprecedented narrative mosaic spanning eleven years and eleven franchises.
"For all of you who have been on this journey with us since the very beginning, sharing every high and low with your family, your friends, your classmates, your co-workers. Investing so deeply in every character and storyline. Laughing. Cheering Shedding tears.
"Giving so freely of your thoughts and emotions in spirited dialogue, theories, fan art, and fan fiction. Please know that the two of us, along with everyone involved in Endgame, have worked tirelessly for the last three years with the sole intention of delivering a surprising and emotionally powerful conclusion to the Infinity Saga."
It continued: "Because so many of you have invested your time, your hearts, and your souls into these stories, we're once again asking for your help.
"When you see Endgame in the coming weeks, please don't spoil it for other, the same way you wouldn't want it spoiled for you."
They concluded by saying: "Remember, Thanos still demands your silence. As always, good luck and happy viewing..."
Featured Image Credit: Marvel