Just before filming began on Avengers: Age of Ultron, Scarlett Johansson found out she was pregnant. A movie like Avengers can't just be delayed, so Marvel used a variety of tricks to hide her pregnancy, including shooting Black Widow from the waist up, using three near-identical stunt doubles and CGI-ing out her growing belly. This is just one of the facts packed into the latest episode of You Think You Know Movies, which follows the latest adventures of Earth's Mightiest Heroes!

Here's a weird Age of Ultron fact: the movie features four of the Avengers getting choked. Iron Man gets choked by Thor, Hulk gets choked by Iron Man and Thor and Captain America each get choked by Ultron. That's a lot of choking.

“You Think You Know Movies?” is a ScreenCrush original series that dives deep into the cinematic worlds of your favorite movies and freeze frames a few tidbits you might not have known. We’ve already tackled Star Wars, the original Avengers and Spider-Man, but now, it’s time to assemble with this Avengers video!

Watch more installments of ‘You Think You Know Movies?’ below and let us know what movies we should cover next.

Check Out 100 Movie Facts You Might Not Know

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