|"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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An Exploding Tuba is a magical musical instrument. It probably explodes after or during playing it. In 1902, a performance of the Wizarding Suite (which included this instrument) blew the roof off the Town Hall of Ackerley, and lead to the piece being banned.