Students in class are divided in groups and groups work together to win the trophy at the end of the day.
I use this mostly to motivate students to hurry up between a lesson and another. Ex. Group 1 is ready and waiting for the teacher to start the next lesson.
Cars race throughout the day and the fastest car will win the trophy at the end of the day.
Students will encourage each other to hurry up/behave etc. and therefore they will learn to work as a team.