This morning on the N-R, it was very crowded and very quiet as usual. This one foreign girl (she was Scandinavian of some sort) was talking at normal speaking volume to her friend. Since she was the only person on the train who was talking, her friend shushed her and said, “Everyone can hear you!”
I don’t know why, but something about that was funny to me. Maybe it’s because “everyone” is a stranger and doesn’t care, or maybe it’s because there’s no real reason for the unspoken rule (no pun intended) of staying quiet on the subway in the morning.