I heard today for the first time ever that it is supposed to be said "you've got another *think* coming." I always understood it as meaning, If you think this way, a negative consequence "some thing" is on its way to straighten you out. Not the thinking itself which will be redone, but the consequences of that way of thinking. I still prefer "thing", since this is what I mean when I say it. In fact, after that consequence comes I/they might rethink my/their initial position. Or it might be that the consequence is the end of it and they never change their opinion, just get that lovely bad thing as a result. Besides, "another think coming" implies that a think is a thing, when think is a verb. In no other ways do I use think as a noun. A think is coming. Incorrect. A thought is coming. Correct. To fight over this "grammar rule" when it is breaking grammar rules to even say it is silly. If anything, it would need to be..."If you think...you've got another thought coming." Just my two cents.