Who started the thing where you hold a buttercup under your chin to see if you like butter?

Curious to know who and why we do it.
Update: As I suspected...... this question so far has attracted stupid answers. Oh well, if there are any decent people who may know the answer please write. Thanx
Update 2: to johnadams48 ...this was a serious question. Someone must have started it, everyone remembers it and on wikipedia all they say is it's superstition! Yeah but about what??
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