It let me think of another joke: A man from China was taking the Driving Test in USA. He was driving the car with the examinder along the road when they were approaching to a cross ahead of them. Then he asked the examiner, 'turn left?'. 'Right!' the examiner anwsered. Then the man turned right and then failed the test.

他的牙齿是假的。

The first answer is to the first question about “teeth”, "假的"=My teeth are denture.(假牙) The complete answer should be "我的牙是假的", but you can simply say "假的" for short. The second answer is to the second question about “The first answer”. "真的"=The answer that I said my teeth are denture(false) is true, The complete answer should be "我的回答（我刚才说我的牙是假的这个回答）是真的". Hence, his teeth are denture. 他的牙是假的。 Zander’s answer is a similar joke. But seems that Ming's answer has no similarity.

A:你吃饭了吗？ B：恩！ A：吃的什么？ B: 恩？ A: 吃苹果了？ B：恩。 A:吃香蕉没？ B:恩。 A:吃西瓜妹？ B：恩。 A:你怎么那么爱说“恩”？ B:恩？ A: 你喜欢说恩吗？ B:恩。 A：你真没意思？ B：恩？ A:一直说“恩” 有意思吗？ B:恩。 A: 去你的，我受不了了？ B:恩? 你要去自杀吗？

lol:D