The sound comes from the suit up sequences in Marvel's Iron Man films, beginning with the 2008 movie starring Robert Downey Jr. as Tony Stark. Scenes of robotic arms assembling the red and gold armor became iconic, and short clips of the mechanical effects were shared widely on soundboards and in fan edits. Portuguese searches like homem de ferro som helped spread this version online. It remains popular because the effect instantly signals invention, power and a heroic transformation in just a few seconds.