Some foreign students at NUS either blind or pure rude. I left my bag at one of the tables at engine canteen to 'book' it and 2 guys simply chose to ignore it. They happily sat down and started eating. I was standing by my bag, which was on the chair. It was not as if I used a packet of tissue or an umbrella to 'book' table. Luckily we had another table nearby. Perhaps they come from densely populated countries and thus have no problems in sharing tables with strangers. At least have some courtesy to ask?