當個差佬碰到條古惑仔喺度遊蕩時，就趁機會將把刀偷放入條友個袋，然後條友喺差館先至知道搭豬頭骨喇。
When a policeman comes across a boy wandering around, he takes the opportunity to steal a knife into a friend's bag, and then he learns about a pig's skull at the police station.