I don't think you should even blame the jam. It's Xmas eve, what do u expect? And it's the holiday season now. So massive jam like this is pretty normal. Just so you know there's toilet located at the checkpoint. You just need to ask the immigration officer. It's all about initiative. And to the stomper, do you know that it is prohibited to take any photographs or videos at the checkpoint. It's against the law. Didn't you read the signage?