"ゴジラ" is pronounced "Gojira", the Japanese spelling and pronunciation for Godzilla....or at least it would be if ゴジラ was what I'd got Reuben saying. I've only just realised upon getting this question I've accidentally misspelt the Japanese word. So instead of "ゴジラ" I've written "ゴリラ" - which means Reuben is actually shouting "GORRILLA!"

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Lesson one - never do translations at 4am drunk on deadline day.