This will probably be the sweetest, most heartwarming thing you'll see all day.
Actor Robert Downey, Jr., who (of course) plays superhero Iron Man, surprised a seven-year-old amputee with a bionic arm -- and it looked absolutely badass.
The boy, identified only as Alex, visibly lit up with wonder as Downey, Jr. opened the case containing the arm.
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Downey, Jr. recorded the moment and posted the video to his Facebook:
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