One summer day, I was planning to visit Washington DC for college visits and I forgot to bring my ID and I could not get on the train, so I gave up and went to visit the colleges around the downtown philadelphia howver, I later figured out that the train people actually do allow me without the ID since I was student. and I regreeted that I had just got rid of 80dollar trip ticket etc.
MY friends were also upset that I could not go, and some actually stayed with me and they were even more upset when we figured that we could go without the ID.