"You have another think coming"
Along the lines of things jibing and things champing at the bit, a note in the Chicago Tribune's Daywatch e-mail sends me to learn about the phrase I've always known as "If you (yada yada), you have another thing coming."
According to the e-mail and an Alt-Usage-English page, what you have coming is actually "another think."
(The page comes from AUE's FAQ, a list of construction possibilities that will please most word lovers. You voracious ones especially.)
