Huh.
#TIL: Some other persons pet peeve is that it is »have another think coming« not »have another thing coming« (if you think this).
Oddly, i seem to have read over the »k« in not-»thing«-after-all a few times in some books.
Also, the graphs are somewhat interesting: The phrase became common only recently, and in British English »think« is still clearly ahead of »thing«.