I need suggestions, mommies on how to teach a four year old the discipline of standing in a queue for his turn. (That many adults have not learnt it yet is another story :))

Every time the school bus arrives in the morning, my fellow literally throws up a ruckus to get in first. I have tried everything from holding him back, explaining, even bribing and to talking to him after school. Back home he listens patiently and agrees to everything I say but come morning and the bus he is ready in action. While some parents at the stop are tolerant, others clearly show their displeasure. I am torn between keeping him calm and justifying to others about his behaviour that is very recent. I am hoping its a phase. Do tell me how you handled such behaviour in your kid. @asha chaudhry , @Priya Sood