Vita-Wonk

Let me just say quickly that in the end, after lots of boiling and bubbling and mixing and testing in my Inventing Room, I produced one tiny cupful of oily black liquid and gave four drops of it to a brave twenty-year-old Oompa-Loompa volunteer to see what happened.'

'What did happen?' Charlie asked.

'It was fantastic!' cried Mr Wonka. 'The moment he swallowed it, he began wrinkling and shrivelling up all over and his hair started dropping off and his teeth started falling out and, before I knew it, he had suddenly become an old fellow of seventy-five! And thus, my dear Charlie, was Vita-Wonk invented!'

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Charlie and the Chocolate Factory, Chapter 16