When it came time for 7-year-old Alex, who was born with a partially developed right arm, to be presented with a 3D-printed bionic limb developed by Albert Manero, Robert Downey Jr. wanted in on the action.

Dressed as bionics expert Tony Stark, the star greeted the young superhero fan in a hotel room, where Downey compared his Iron Man gauntlet to Alex's new arm. "You know who that is?" a Alex is asked in the video below. When Alex responds "Iron Man," the actor can barely contain his joy.

Manero, a college student, is the founder of Limbitless Solutions, which develops affordable artificial limbs for, in Downey's words, "families with kids who want to show the playground how badass they are."

"I'm probably going to start farming out a lot of my tech work to Albert, too," Downey says in the video. "I feel like he could cut the price point down on one of my suits, which is right now, I don't know, about a billion and a half dollars."