Why is it you feel like a dope if you laugh alone, but that's usually how you end up crying?

Why is it you feel like a dope if you laugh alone, but that's usually how you end up crying?

为什么当你一个人笑的时候，你会觉得自己像个傻瓜，但那通常是你哭的原因?

-- Chuck Palahniuk 恰克·帕拉尼克