Zaphod signed the order for the Earth to be destroyed. The mice try to capture Arthur to extract his brain, but he escapes and squashes them. The Vogons try to capture the crew, but Marvin defeats them by shooting them with a gun which forces them to see his point of view; thus they all instantly become incredibly depressed and collapse. Slartibartfast rebuilds the Earth Mark 2, but Arthur asks if he can go on exploring the universe with the crew instead of being part of it again, and they fly off together.
Trivia: At the very end of the film, when the group uses the Improbability Drive to go to the Restaurant at the End of the Universe, there are a lot of images that flash onto the screen when the drive is activated, so in the other parts of the film. In this case, the very last image shown is the face of Douglas Adams, the creator of the Hitchhiker series.
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Answer: He's trying (very badly) to pretend that it's a weapon of some sort.
Tailkinker ★