I Love You 3000 Times thank Tony Stark shirt
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Before the credits appeared, there was a snapping sound. Listen more closely, the audience can feel it is the sound of a hammer or metal object. According to "Entertainment Weekly", it was the sound that Tony Stark emitted in the first armor when he was trapped in a cave in Afghanistan in the first film of "Iron Man". This can be seen as a subtle and touching tribute that the filmmaker made, as a final act to honor Iron Man - Tony Stark after his great sacrifice.