Just China be funny.
Don't worry. They'll tell you.
It's the one who has knee pads on.
Disclaimer: I don't know how well this joke will work in English. What's yellow and lies in a pond? An excevator. You don't think this is funny? Neither does the operator.
If she's only wearing one sock. (This joke brought to you courtesy the homeless guy outside my local 7-11.) Edit: tweaked the punchline.
Cha ching
Wonton.
Because he khan.
Because the Chinese don't like Tibet...
To get laid.