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Originally designated as a zero-rated food and not a beverage, milk was viewed to be reclassified when the definition of a beverage was widened (Value Added Tax (Beverages) Order 1993) for those who want to do some further reading. An exception was then created for milk (overriding item no 6 Milk and preparations and extracts thereof) to allow it to retain its zero-rating for VAT. Hooray!
Explanation
Clyde is the orange ghost in Pac-Man, Boo is the ghost in Mario.