A warmer with no preparation time needed, and which always gets a few laughs is the non-stop speaking game. Write the students' names on the board, and borrow a digital watch off one of the students. Then, give out the instructions. Each student in turn will be given a topic, which they must speak about for a minute without pausing or hesitating at all, and without using er, um, doodah etc. They are timed by you and you will put their relative scores on the baord to see who's the winner. Now you can weight each student's difficulty level by choosing the category. For a weak or shy student they might be asked to talk about their family, or their favourite music; for the know-it-all student by contrast, ask them to talk about wallpaper or orange trousers. Needless to say, the one who lasts the longest is the winner!