Robert Downey Jr. Surprises Child with New Bionic Arm [Video]

This is why Iron Man is the coolest superhero. Get the tissues ready.

Robert Downey Jr. continues to be one of the coolest celebrities in Hollywood. I love when an actor gets into character to make a child's day better. Not only did the Iron Man surprise this child, but he hooked him with a real bionic arm! Hollywood needs more people like Robert Downey Jr.