Blonde
There are 2 women getting ready to leave for work.
The brunette gets in the driver's seat and the blonde gets in the passenger's seat.
The brunette says: "We're late, so you watch out the back window for cops." As she speeds down the road she asks the blonde:
"So, do you see any cops?"
The blonde replies: "Yes!"
The brunette says: "Are they behind us?"
"Yes!"
"Are they close?"
"Yes!"
"Are they going to stop us?"
"I don't know!"
"Well, are their lights on?"
The blonde replies: "Yes, no, yes, no, yes, no...!