A blonde and a brunette are out driving, and the brunette tells the blonde to look out for cops - especially cops with their lights on. After they've been driving for a while, the brunette asks the blonde if she's seen any cops.

"Yes," says the blonde.

"Are their lights on?"

The blonde has to think for a moment, then says, "Yes. No. Yes. No. Yes. No."
一个blonde和一个Brunette在驾车，Brunette让Blonde寻找巡察——尤其是那些亮着灯的巡警。她们开车开了一段时间，Brunette问Blonde有没有看到什么巡警。
有，Blonde说
他们的灯亮着吗？
Blonde想了一会儿，说，有，没有，有，没有，有，没有