Matsushita earned the nickname "King Hiro" from Emerson Fittipaldi, who was complaining about Matsushita's reluctance to cede track position when getting lapped by the leaders. The nickname came about as a result of the voice-activated microphone ("vox") Roger Penske's team was using. Fittipaldi's epithet was said so quickly that the circuit cut off the first syllable of the first word he used. Fittipaldi, allegedly, had intended to say "Fucking Hiro!"