40+ classes.... That brings back memories!!!
I have found that STOP THE BUS always works... Each student has a piece of paper... you need to determine 5 categories (most popular ones are usually (Place/Food/Animal/Thing/Famous Person)
Either yourself or by nominating students, a letter is picked and the students start filling in the sheet using the specific letter..
For example: A -- Australia/Apple/Ant etc
When it gets competitive its fun..
Ang from sydney