|"Is this all real? Or has this been happening inside my head?"
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|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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A plumber is someone who fixes or puts in piping systems and plumbing fixtures.
Mr Mason had an anecdote about some American plumbers that Petunia Dursley claimed to have been dying to hear, in 1992. Vernon Dursley also told a joke about plumbers to Mr Mason during a dinner party in 4 Privet Drive, in 1992.