It's an unwritten rule among Marvel fans: never spoil the ending of a movie. But Kim Kardashian apparently didn't get the memo, and ruined the ending of "Spider-Man: No Way Home" for her 273 million Instagram followers.

On Monday night, Kim holed up in her home theater to watch Tom Holland's latest film.

Toward the end of the movie, she decided to take a picture of the screen and share it on her Instagram Story.

(Don't worry, we won't replicate Kim's mistake by saying what specific spoilers there were.)

The reality star must have realized her mistake and deleted the photo just hours after uploading it. But by that point, the damage was done, and Marvel fans quickly took to Twitter to express their dismay (and anger) over Kardashian's cinematic blunder.

For many, the threat of COVID was still looming large, so they waited until Spider-Man was released on Disney+. They were quick to point out that Kim should have been more sensitive, as opposed to posting pictures from the luxurious home theater of her mansion.

You can imagine what these angry tweets look like, but we're more for your reading pleasure... Emotional... We have compiled a few of the things. See them below:

"I'm seeing Spider-Man tomorrow, so I'm muting all Spider-Man-related tweets on all my socials to avoid spoilers: ....... Just not Kim Kardashian posting spoilers on her ig: ......" (@GeorginaaSparks)

"Of all the Spider-Man spoilers, I never thought Kim Kardashian would spoil it." (@nickayla)

"I didn't think Kim Kardashian would spoil it in the Spider-Man spoilers. (@nickayla)

"Why did @KimKardashian ruin Spider-Man for me? What did I do to you?" (@_QveenElla)

"I spent all this time without Spider-Man spoilers just for Kim Kardashian to ruin it for me on her insta story" (@urfavvirgoken)

"Your own Nothing says privilege like getting a movie in a private theater and ruining it for those of us trying to stay safe at home!" (@goalstone22)

"I spent this time with no spoilers for Spider-Man, and I'm not going to let that ruin it for the rest of us! (@goalstone22)

"I don't follow Kim Kardashian and the moment I decided to go to her story on Instagram, I posted a Spider-Man spoiler. I've never hated someone so much" (@serenearaya)

"Kim Kardashian of all people spoiled #SpiderMan for me! I follow her on IG for morbid curiosity and it bit me in the butt! I had to wait until it was streaming because of covid. I'm so angry now!" (@sarahwandered)