| We used to get 3 bathroom passes per six weeks (colored paper, teacher wrote the name in permanent red sharpie to cut down on reproductions), and each one we had left at the end of the six weeks we got 5 points added to our grade.
Also, as kind of the opposite thing here, when I was in elementary school, we had a chart on a clip board at the front of the class, and if we did something bad, didn't turn in homework, etc, we had to write our names on the board and our teacher would put a check by our names on the chart. Each thing bad we did after that, we got another checkmark on the chart (a weekly tally) and a check mark on the board next to our names. Three checkmarks on the board and we got sent to the principles. Bear in mind, I was in private school with 7 kids in the whole grade, so this worked nicely. I don't know about 80+ though.
I don't know if you could tweak these to work for you, but decided to comment anyway =D. | 
THANK YOU!!!!!!!!
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