Well, to be fair the cite you offered offers some support for ‘thing’ as well, but I had no idea that ‘think’ was common usage. Because I’d never, ever heard “you’ve got another think coming” until I read it on this board. It’s always been “You’ve got another thing coming” where I’m from, and it’s a fairly common phrase.
But I concede. ‘Think’ is proper usage, but ‘thing’ is clearly well used as well. I’d say it’s optional.
Regarding the whole “think vs. thing” debate, it’s been done. The consensus in that thread, as reached by me, was that the intent behind each of the two phrases was different, and thus they are no longer two variants of the same phrase, but two seperate phrases with a common origin. As I am the ultimate arbiter of all things, my self-consensus is to be taken as law. I expect no further debate on the matter.
I agree completely. I never, ever heard "another think" until I read a grammar thread about it on this board. Everyone I know uses "another thing".
One of my former co-workers used to write directions: “Go passed the old oak tree…”
I know this is pronunciation and not grammar but since someone mentioned supposably…Try getting someone from where I grew up to say “specific”. It’s pacific. End of story.
Library is Libary
Probably is Probly (though I’m guilty of this one in speech sometimes, at least I don’t spell it like that; a lot of people do.)
Etc.
If you’ve never worked in a fast paste environment, you’ve never tried to glue something using 5-minute epoxy.
Who is this person named Go, and did he live? Perhaps it was really just an oak sapling (still, it’s painful just to contemplate passing one anyway!) 
–SSgtBaloo
[QUOTE=Q.E.D.]
Wrong. Despite whatever misusage has wormed its way into the lexicon, the original phrasing was “you’ve got another think coming”.
I have to agree with Sam Stone, it’s “You’ve got another think coming”. And how about arguably and inarguably. I always thought that if someone said something like “Bobby Orr was arguably the greatest hockey player ever”, that would mean that he really wasn’t, there would be some sort of argument against the staement. Now if he was inarguably the greatest player ever, wouldn’t that be indisputable?
Arguably: doesn’t mean he really wasn’t, but that you can make a case that he was (though, perhaps not indisputably). 
–SSgtBaloo
I am heartily with the OP. I have mellowed out a lot about grammar since my younger days, but when someone uses a common phrase, but clearly doesn’t understand the words that make up the phrase, that still gets me.
My personal non-favorite is “tow the line” for “toe the line.” In case there is any ignorance out there to be fought, the imagery is of a line in the sand. When being asked to toe the line, you are being asked to obey the rule and keep your toes exactly on the line, without crossing it. A usage example: Since I report to the CFO, I am expected to toe the line in submitting proper expense reports.
I heartily concur. Even my (user)namesake, whose intelligence I greatly respect, seems to have made this mistake in the lyrics to his latest album. Of course, the lyrics (as posted onto the Official Tears For Fears Website) also contain a number of typographical errors, so I’m willing to give Roland the benefit of the doubt.
TFF aside, the phrase doesn’t make any sense if “tow” is used in place of “toe”. Sure, one can tow something by attaching it to oneself with a line, but personally I’d refer to that as towing the object rather than the line. You don’t tow a trailer hitch, you tow the trailer.
Those of you who absolutely insist on “think”, well, you’ve got another. . .
You are just going to have to accept that “another thing” is pretty thoroughly entrenched in the general population. Please don’t make any judgements about anyone’s education or intelligence based on the variation of this phrase they use.
Perhaps it is largely a regional thing? I grew up mostly in Kentucky, and like BiblioCat, I am in Maryland now. I had never in my life heard “another think” used until reading it on this message board. I remember reading the phrase once before in a novel and just assuming it was a typo that replaced the “g” with a “k”.
After the previous thread on the subject, I conducted a little survey. I asked a group of people (everyone on my instant messenger buddy list) which version of the phrase they used and if they were aware of any alternate versions. Specifically, I asked them to “Fill in the blank: 'You’ve got another _ coming.” Of the people I asked, all but one have college degrees and most have a graduate degree. Several of the subjects have doctoral degrees in various fields. Five of the subjects are professional writers. The age range was from 23 to 55. One subject was located in Kentucky, one in Colorado, and the rest in Maryland. Only one confessed to being a Judas Priest fan. Here are the results:
“You’ve got another thing coming” : 27
“You’ve got another think coming” : 0
After they answered the question, I asked if they knew any other variation of the phrase. All said they did not. Then I specifically asked if they had ever seen or heard the “think” variation. Only one person said they had seen it used and they had, like me, just assumed it was a typo.
I was reading the website of a local literacy and learning disability therapist.
His work is based on evidenced based research. The phrase is repeated several times.
I say that myself, but sarcastically, and as part of the following phrase:
“I could care less, but that would requiring caring at all.”
I’ve recently become acquainted with a very scary woman who swears up and down that “supposeof” is a word. She means “supposed” and has been told so but swears that everyone else is wrong, the word is “supposeof” and it’s in the dictionary. Just which dictionary has yet to be shown, but it’s in the dictionary, she swears it!
Thanks! That was what I was trying to convey. I may have good grammer, but the words don’t always come out right!
Wow. Don’t ever meet someone from the military.
What possesses you to have this violent reaction?
I didn’t know people thought it would be “thing”. What kind of sense does that make? The other way, it’s a semi-grammatical folksy phrase that makes a real point.
If I say, “If you think you’re going to get a new car, you’ve got another thing coming”, that would mean he’s getting something other than a new car.
Basically it says, “You’re about to get something other than what you thought you’d get.”
That only makes sense in a limited number of cases where the phrase might be used. If I said “If you think I’m doing your work for you, you’ve got another thing coming”, it’s nonsensical. There’s no “thing” coming, in any logical sense.
Three things that make me wince - “intensive purposes” , “could care less”, and “should of”.
Sounds good to me. Incidentally, you’re needed over in Great Debates for some ultimate arbitrarion.