看看以下的影片
在你们狂笑的同时顺便想一想为什么你正在笑呢
http://www.youtube.com/watch?v=mj4eqywBHrs
http://www.youtube.com/watch?v=C_GImtRoT4A
http://www.youtube.com/watch?v=lnicfQ_Hycc
http://www.youtube.com/watch?v=wTAQcNH32H4
http://www.youtube.com/watch?v=JvLHjVb-drs
http://www.youtube.com/watch?v=8HrXPd9jgjc