@YazanHD12 If this happens in Hong Kong, people will press the emerg bottons, which are all over inside the train. All train compartments have surveillance cameras. Staff and police will wait for the suspect at the platform next station.
@Gatchan_desu It's find if they enjoy the extra garlic or other "free" things on the table. That's their right. If everyone do this the shop will no doubt raise the price of their food leading to extra cost for other "normal" customer. Most importantly, why? That's just idiocy.