|"Is this all real? Or has this been happening inside my head?"
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On the London Underground train that Harry Potter and Rubeus Hagrid rode on 31 July, 1991, there was an advertisement for Hampton Court Palace, which featured the slogan "Discover six acres of beauty. Then step outside." This was presumably intended to indicate that the palace's interior can be considered as spacious and majestic as its grounds.
- Harry Potter and the Philosopher's Stone (film) (Mentioned on a poster)