This happened a few years ago on a bullet train heading to Tokyo. Being in the Green Class, there was only one other passenger besides me: a white-haired man in his sixties with glasses, sitting to my left and behind me.

After sitting down for a while, I suddenly felt thirsty. I desperately wanted coffee.

I was wondering if there was a vending machine when I heard the voice of a train attendant from behind me. Perfect timing. As I waited, the old man behind me called out to the attendant, "Could I have a coffee?" The attendant simply replied, "We're out of stock." The old man sighed, "Isn't that always the case?"

The attendant then came over to me. Since I really wanted coffee, I asked, "Is there anything similar to coffee?" The attendant whispered, "...Actually, we do have coffee." Hearing this, I involuntarily glanced towards the old man behind me. He was gone.