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."
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