A sense of empty

Usually I imagine having a conversation with foreigners, thinking how to express my thoughts. The latest one is on the bus. While I stand next to the door, attempting to balance myself, someone rushes to ask, "Where should I get off the bus? I'm going to the Taipei City Hall." That's where I'm going, too, but, guess what? I look out of the window and feel confused. Why the bus moves reversely? With hesitation, I reply, "It seems we should get off right now."