Annoyed with all those guards standing in the metro wanting to check your bag? (as part of stepping up security before the Olympic Games?). Well, I have found a perfect way to avoid them. When they stop you, and direct you to the guy who wants to peek into your bag, you simply tell him:
-My bag's full of my underwear -are you sure u want to take a look?
This has to be said in Chinese, and I swear, if it is a guy he'll let you go without as much as opening your bag. The younger the guy the better. He might even apologize!