The New York City has done its best to chew you up and spit you out alive, and it's only natural that you've worked up an appetite. Eating on the train would kill two birds with one stone, right? Sometimes what seems like the most time efficient idea isn't always the smartest idea. If you frequent the subway, you've probably come across this problem daily. You've either been the annoyed passenger or the one scarfing down food so fast you never saw it as an issue. There is an unwritten rulebook to train etiquette and what you do regarding food could save you from being the biggest jerk in the train car. If you've eaten anything on this list during your commute, you are doing it wrong. Here are some food items that you should never eat on the subway.