Each student randomly picks up one sticker. To each sticker type, point value is associated. You have 15 minutes to do whatever You want (e.g. deception, corruption, seduction etc. *). After 15 minutes, the person (or student group) which managed to collect stickers with highest sum of points will be allowed to establish one rule which the whole class will follow during rest of semester.
* the only thing prohibited is violence
"Man is a 'homo discens,' a learning being. People learn as long as they live. Life is inseparably connected with learning." Horst Siebert