A good excuse

A man was driving home late one afternoon, and he was driving 
above the speed limit.  He notices a police car with its red 
lights on in his rear view mirror.  

He thinks "I can outrun this guy," so he floors it and the race is 
on.  The cars are racing down the highway -- 60, 70, 80, 90 miles 
an hour. Finally, as his speedometer passes 100, the guy figures 
he can't outrun the cop and gives up.  He pulls over to the curb.
 
The police officer gets out of his cruiser and approaches the car. 
He leans down and says "Listen mister, I've had a really lousy day,
and I just want to go home.  Give me a good excuse and I'll let 
you go." 

The man thought for a moment and said, "Three weeks ago, my wife 
ran off with a police officer.  When I saw your cruiser in my rear 
view mirror, I thought you were that officer and you were trying 
to give her back to me!