Why do we say we had a “crank” call, when the call was really a “prank” call?

Question by mstylv: Why do we say we had a “crank” call, when the call was really a “prank” call?

Best answer:

Answer by AviationMetalSmith
a) The guy asking the question is a crank.

b) The phone is so old, it has a crank on it.

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