At work today one of my bosses was saying how their daughter had laughed at them for saying the phrase "If you think you're going out tonight you've got another think coming", saying think instead of thing. When most of us said we would have done the same we turned to polling the staff, which gave us half agreeing with think and half agreeing with think (and those saying think being of an older generation, bar one 65 year old)and the other half saying it was thing. So I'm curious, what do you say, and what is right?