WandaVision [1] is packed with references to other superhero properties [2], but we definitely did not expect a reference to Kick-Ass to show up! The 2010 superhero movie (and superhero movie satire) is technically based on a Marvel property, but its presence in WandaVision [3] is purely a joke about casting, not a hint about anything we should be theorizing about.
The scene is so quick, you might miss it! During a trick-or-treating sequence, Tommy is particularly delighted at his uncle Pietro's suggestion that they go trick-or-treating together (with the implied advantage of Pietro's super speed). "Yeah, kick-ass!" he exclaims. As they head off together, Wanda is left behind, repeating "Kick-ass..." to herself. It's framed like a classic '90s sitcom trope of a mother being exasperated at her kids learning more mature language, but the repetition highlights that this is no throwaway line of dialogue.
In fact, it's a reference to the fact that playing Quicksilver isn't the only thing that connects Aaron Taylor-Johnson and Evan Peters. Both starred in the 2010 movie version of Kick-Ass: Taylor-Johnson as wannabe vigilante Dave Lizewski (aka "Kick-Ass") and Peters as his pal Todd. Amusingly, there's a recast twist involving Peters in that franchise too. In Kick-Ass 2, Todd tries to become a vigilante like his friend, but he's no longer played by Peters; at the time, CinemaBlend reported that Peters's involvement with American Horror Story [4] may have caused a scheduling conflict [5] that required him to drop out of the sequel. This time, it's Peters who is the "recast" version of an old character!
In a weird way, it's almost nice to have an Easter egg in WandaVision [6] that doesn't require too much overthinking or theorizing! While most of the little hints and allusions to other superheroes [7] have us trying to figure out what it could mean for the show and for the Marvel universe as a whole [8], this one is just a silly, fun casting joke!