it is during that one scene where Umbridge sacked Trelawney. You are a professor at Hogwarts (You choose which subject)

Trelawney: "No! NO! This cannot be happening... it cannot... I refuse to accept it!"

Umbridge: "You didn't realise this was coming? Incapable though you are of predicting even tomorrow's weather, you must surely have realised that your pitiful performance during my inspections, and lack of any improvement, would make it inevitable that you would be sacked?"

Trelawney: "You c-can't! You c-can't sack me! I've b-been here sixteen years! H-Hogwarts is- my h-home!"

Umbridge: "It was your home, until an hour ago, when the Minister of Magic countersigned your Order of Dismissal. Now kindly remove yourself from this Hall. You are embarrassing us."