VIDEO : Robert Downey Jr. Cheers Up Sick Boy With 'Captain America 3' Invite

Aside from playing superhero Tony Stark/Iron Man in blockbusters such as Marvel's Avengers: Age of Ultron, Robert Downey Jr. has proven on several occasions that he is a real-life hero, especially to brave young kids. Back in March, Robert Downey Jr. teamed up with Microsoft's The Collective Project to present a new 3D-printed bionic arm inspired by Iron Man to a young boy named Alex Pring, who was born with a partially-developed right arm. Today, the actor posted a strange photo on Instagram of himself in a silly Tigger costume from Winnie the Pooh, and as it turns out, this was also part of an effort to help another young boy, inviting him to the Captain America: Civil War premiere.