And now, you're not the driver, you really feel helpless until you notice standing next to you, leaning over the bridge is a very fat man.

但你不是电车司机，你真的爱莫能助,直到你发现，在你旁边，靠着桥站着的,是个超级大胖子。

耶鲁公开课 - 公正课程节选