From the fact that it's extremely strong for house elves I imagine :P People have made various versions of it online. The easiest reproduction of it is cream soda with buttershots schnapps.
Also I've had chocolate frogs Cadbury's started making them. Sadly, they don't jump.
I swear I read it somewhere though. Maybe JKR commented on it or something.
Did the Chocolate Frogs come with trading cards?
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Cadbury's started making them. Sadly, they don't jump.
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