MCU: 12 Things You Learn Rewatching Avengers: Age Of Ultron

10. The "Prima Nocta" Joke Is Totally Embarrassing

Though the first-act Avengers party sequence is actually one of the movie's best scenes, it does include one painfully off-note line of dialogue that clearly should've been cut early in production.

When Tony Stark attempts to lift Mjolnir, he jokes that he'll become the ruler of Asgard if he manages to pick it up, before adding, "I will be re-instituting prima nocta."

In case you're unaware, prima nocta was a theoretical - though not necessarily practised - law in ancient Europe, where a land's ruler would be allowed to have sex with any bride on her wedding night.

While Tony Stark's always had a bit of an iffy attitude towards women, especially in earlier MCU movies, the line was clearly supposed to be genuinely funny on its own rather than a rib towards Stark's questionable morals.

A lot of people kicked up a fuss about it upon release, and some three years later, where Stark's sexism has been mostly cleaned up, it really sticks out like a sore thumb.

The fact it was written by Joss Whedon of all people, a card-carrying feminist - despite his recent personal controversies - only makes its inclusion that much weirder. Then again, this is the guy who had Loki (Tom Hiddleston) call Black Widow a "mewling quim" in the first Avengers movie (which translates roughly to "whining c***").