10 Most Meta MCU Moments Ever

10. "She Recast Pietro!?"

Few MCU moments have ever caused a social media meltdown quite like WandaVision's fifth episode, "On a Very Special Episode...," which concluded with a shock cameo appearance from Wanda's (Elizabeth Olsen) dead brother Pietro.

Except, those understandably expecting to see Aaron Taylor-Johnson reprising his role from Avengers: Age of Ultron were left with their jaws on the floor when the part was instead played by Evan Peters - who played the character in Fox's X-Men movies.

To hammer the shock home, we even then hear Darcy (Kat Dennings) exclaim, "She recast Pietro!?"

Though WandaVision as a whole is a relatively self-aware show about the nature of television itself, pulling an outrageous bait-and-switch by swapping Taylor-Johnson out for Peters was on a whole other level.

Even though the ultimate outcome - that "Pietro" was actually a Westview resident possessed by Agatha Harkness (Kathryn Hahn) - rubbed many fans the wrong way, there's no denying the Internet-breaking brilliance of that fourth wall-obliterating reveal. Genius.