The Marvel Cinematic Universe turned post-credits scenes into one of her defining trademarks. Ever since Nick Fury stepped out of the shadows at the end of the year Iron ManFans enjoyed sitting through the credits, waiting for a surprise cameo, a shocking twist, or a tantalizing look at the superhero franchise's future projects. However, not every post-credits scene went down well with viewers.
Many post-credits scenes disappointed fans, whether they hinted at something that hadn't happened yet, confused the audience, or simply felt underwhelming compared to the scenes that preceded them. This is especially true for the last few years, especially after that Avengers: Endgame. The MCU's best post-credits scenes are still celebrated, but a few disappointments have faded from memory.

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Spider-Man: Homecoming has 1 final joke
While some fans wondered Spider-Man: HomecomingThe post-credits scene was hilarious, others thought it was a boring and forgettable joke that wasted an opportunity for a big tease. At the end of the film, Steve Rogers walks in front of a white background and gives a speech about the importance of patience and how it can sometimes lead to disappointment. It was a funny meta joke about fans waiting for the credits to roll to see what the MCU had in store for them.
The joke was instantly shared Home-coming viewers. It was a playful way to poke fun at the tradition of the MCU's post-credit scene, but because it deliberately avoids setting up future stories, including Avengers: Infinity Warwhich was scheduled for the following year, is rarely mentioned among the MCU's best final scenes. Unfortunately, the PSA's “patience” has no rewatch value like other great and funny lines in the franchise, as it merely told the audience that they weren't waiting for anything.
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The MCU never followed up on Doctor Strange's second ending scene
End Doctor Strange featured an exciting scene that centered on Karl Mord becoming completely disillusioned by the misuse of magic. Mordo pursues Jonathan Pangborn and strips him of the magical energy that allowed him to walk again and embrace a much darker philosophy. The post-credits scene set up Mordo as a great antagonist Doctor Strange sequel, but unfortunately, as seen in Multiverse of Madnessit was completely abandoned. Instead, fans got a sort of consolation prize in the form of an alternate version of Mordo.
Almost ten years later, the Earth-616 version of Morda that was teased Doctor Strange has yet to pay off in any meaningful way, disappointing fans who were excited after such a great post-credits scene. This quest was once a promising plot thread, but has now been largely forgotten due to the considerable amount of time that has passed.

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Iron Man 3's post-credits scene undermined one of the MCU's most introspective films
MCU jokes can often fall flat, especially when they undermine the tone of an otherwise serious or emotional scene. One of the biggest examples is the ending Iron Man 3where a post-credits scene reveals that Tony was actually narrating the recent events to Bruce Banner, therapy-style, all while Bruce slept. He woke up to tell Tony that he was “not that kind of doctor” before falling back asleep. It serves as a light punchline after a particularly deep film.
Iron Man 3 was a character-driven film that focused on Tony Stark's mental well-being and panic attacks. What could have been an important bonding scene between the two characters was tossed aside for a joke that felt a little off. Phase One taught MCU fans to expect major revelations from the post-credits scenes, so the joke felt pretty anti-climactic. It didn't advance Tony's story or hurt future projects, and is largely overshadowed by Iron Man's far more significant scenes in the franchise.
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The Eternals had two post-credits scenes
Eternals had two post-credits scenes, but the second one seemed to have the biggest impact on the MCU. It was a perfectly good scene where Dane Whitman hesitates but finally decides to pick up the Ebony Blade, a weapon that can cut through anything at the cost of the user's mental state. Just before he picks it up and seemingly embraces his comic identity as the Black Knight, a man walks in and asks him if he's ready for this. Marvel later confirmed that the voice was Mahershala Ali's Blade.
It seemed poised to introduce an exciting supernatural angle to the MCU, but the post-credits scene actually ended up being one of the franchise's most frustrating backlogs. He teased Ebony Blade, Dane Whitman's transformation into the Black Knight, and introduced Blade, but almost nothing happened with either story. That's probably thanks Blade'with development hell and EternalsA lackluster success that made it one of the most disappointing forgotten post-credit scenes.

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Avengers: Age of Ultron featured the iconic line in an unforgettable scene
Avengers: Age of Ultron ends with one of the franchise's most iconic lines, “Fine, I'll do it myself,” as Thanos retrieves the Infinity Gauntlet. The short scene was designed to show that the Mad Titan would finally emerge from the shadows, setting the stage for the final conflict of the Infinity Saga. While seeing Thanos don the Infinity Gauntlet created a lot of hype among fans, the scene was downright confusing.
Thanos' line alludes to the fact that Loki and Ronan failed to obtain the Infinity Stones and these failures made him take matters into his own hands. However, the scene comes after Ultron's defeat, suggesting that the villain's downfall was the catalyst for Thanos' appearance, despite him having no meaningful relationship with Ultron in the film. Thanos' quote eventually became iconic thanks to Infinity War, but the post-credits scene never explained why the Mad Titan decided to intervene at this particular moment. Many fans remember the line, but few can fully recall the scene.