Since Bowser is invulnerable to fire, then why has Mario always finished him off with a fire attack? In Super Mario Bros., Mario always dropped Bowser into a pool of lava, when we already know that Bowser can't be harmed by fire...why else would he have moats of lava in his castle?
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"I am the mighty Shigeru Miyamoto! You will all bow down to me, for I am the God of videogames!"