Wiktionary
have another think
vb. To reflect on a frustrating or disappointing event; to reframe such an event.
Usage examples of "have another think".
So if you think you're leaping out of bed this minute, you'd better have another think coming.
They may show you that you have another think coming-that there is some limit, after all, to your vaunted influence.
She says if you think she'll meekly go away, you have another think coming.
I couldn't sleep, and so I come along up-street 'bout midnight, a-turning it all over, and when I got to that old shackly brick store by the Temperance Tavern, I backed up agin the wall to have another think.
They may think we're stupid animals, but before you two and the Triplanetary Patrol and the Service get done with them they'll have another think coming.