Thanks for that, John. You THINK something, are mistaken, have to THINK again. It has become corrupted and perhaps it is more acceptable in Australian English. Here's what the Cambridge Dictionary has to say on the matter: https://dictionary.cambridge.org/dictionary/english/have-another-think-coming And here's an article by Professor of English at the University of Michigan on the subject: https://www.michiganpublic.org/arts-culture/2019-02-03/if-you-think-you-know-this-idiom-you-may-have-another-think-coming Judas Priest has popularised the corrupted version of this idiom.

💻English for work 💯English for study & exams 🧭English for life ____________________________________________________________________ ✨☀✨☀✨ Hi there! Idioms! Yikes! They can really enrich your vocabulary but they can be a mind field, or should that be minefield? Here is an idiom that even native English speakers can get wrong. The answer to this is definitely thing. They had another thing coming.