Tony Stark's (Robert Downey Jr.) sunglasses in “Iron Man” became a permanent part of his look, but they initially served a much more practical purpose.
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Robert Downey Jr. Used Cue Cards As Tony Stark
The start of the "Iron Man" story was a missile presentation, back when Tony was still eager to sell weapons and show off his company's destructive capabilities. In true corporate fashion, Tony gave a speech about the power of his new products, intoning, "Is it better to be feared or respected? I say: why not both?" Downey, Jr. wanted that line to feel orchestrated, but also kind of off-the-cuff. Recently the actor revealed that the speech (and others) was printed on cue cards.