What makes your favorite movie your favorite movie? Most often, it’s the realistic acting that makes you feel like the story is real. However, sometimes that great acting isn’t acting at all.

1. Geoffrey Rush as Captain Barbosa in Pirates of the Caribbean: Dead Man’s Chest

Dead Man’s Chest is the second movie in the Pirates of the Caribbean series. Fans of the movie may remember when Geoffrey Rush, who plays Captain Barbosa, surprised the other characters with his return. The other characters are delightfully surprised to see their old friend. In reality, though, they had no idea he was coming, and they really were pleasantly surprised to meet up with their former costar.

2. Will Ferrell as Buddy in Elf

Near the beginning of the Elf Christmas movie, Will Ferrell is shown as Buddy opening Jack-in-the-Boxes. His shock looks so authentic when the real Jack-in-the-Box opens, you may think he really was surprised. You’d be right! Ferrell wasn’t told which Jack-in-the-Box was going to open so that his reaction would be more believable.

3. Millie Bobby Brown as Eleven in Stranger Things

In season three of Stranger Things, Eleven is shown fighting her friend’s possessed stepbrother. In the scene, she falls back into the arms of Finn Wolfhard (who plays Mike Wheeler in the series) in exhaustion. This part of the scene wasn’t planned, and if you look closely at Wolfhard’s expression, he is looking up at the directors. In truth, Brown was incredibly exhausted from the scene.

4. Tom Holland as Peter Parker and Robert Downey Jr. as Tony Stark in Spider-Man: Homecoming

In one of the scenes of Spider-Man: Homecoming, Tom Holland improvises a hug between his character, Peter Parker, and Robert Downey Jr.’s character, Tony Stark, in an attempt to make viewers laugh. However, Downey Jr. recognized that the relationship between the two characters wasn’t there and wanted to save the scene, so he improvised the well-known, “That’s not a hug, I’m just grabbing the door for you. We’re not there yet,” line.

5. Vivienne Jolie-Pitt in Maleficent

Because of Angelina Jolie’s appearance in her role as Maleficent in Maleficent, children were scared to act with her. Her own daughter, Vivienne Jolie-Pitt, ended up getting the role as young Aurora, who is completely unafraid of her own mother. Jolie-Pitt plays with Jolie’s horns in an authentic attempt to get her attention.