Ice cream rewards for class management

The science teacher had an interesting method of getting students to do their best in class.

As seen below, she drew a huge Icecream cone. Beside it was a set of categories. If they got a checkmark in at least 5 caetgories they got to colour a line across the bottom of the cone.

When the cone was full, the class got an icecream party and then started over.

I've never seen anything like it before, but I LIKE it!