有时候人的脑子会自己急转弯！

晕倒。总算看明白了。

Smoking might not sound so dangerous at all but a small cigarette butt could easily ignite papers such like tissue! Of course, I guess you can then imagine the rest of the story, it's all chain reaction! Make sense? In fact, this is exactly the reason scientists believe tornadoes in USA are caused by farts in China!