Endgame contains a deep cut reference to the first Iron Man movie.
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Iron Man, of course, kickstarted the MCU back in 2008.
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In that film, Tony Stark requests a cheeseburger upon returning to America.
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At a press conference, Tony announced his company would stop making weapons.
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Flash forward to Endgame, and Tony's daughter Morgan asks for a burger after Tony's funeral.
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This makes Happy Hogan laugh as he thinks about Tony
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Burgers actually played a major role in helping RDJ get his life back on track.
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A burger once disgusted him so much, he threw all of the drugs in his car into the ocean.
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