10 Movie Scenes You Never Knew Used Body Doubles

10. Tony Stark Calls It "Quits" - Iron Man 3

Though it's no secret that the Marvel Cinematic Universe regularly uses stand-in performers to help achieve some of the digitally de-aged likenesses of its stars, Iron Man 3 features an especially sly sleight of hand where Robert Downey Jr. is concerned.

Prior to shooting the film's final scene, in which Tony Stark (Downey Jr.) returns to the remains of his house, Downey Jr. suffered a debilitating leg injury, forcing director Shane Black to complete the scene using a combination of a body double and a CGI "mask" of the actor's face.

While the VFX trickery is subtly noticeable once you're aware of it, it's pretty much imperceptible if you don't already know. You'd have no idea you were looking at a digital face pasted onto an anonymous stand-in's body. Incredible.