Designated drunk

A COP WAS WATCHING THIS PARTICULAR BAR KNOWN FOR TROUBLE HOPING TO CATCH A
DRUNK DRIVER. HE WAITS A LONG WHILE BEFORE HE FINALLY SEES A GUY COMES OUT. THE
GUY STUMBLES OF THE TOP STEP AND FALLS FLAT ON HIS FACE. HE GETS UP STAGGERS TO
A CAR, TRIES HIS KEYS FOR A WHILE BEFORE HE REALIZES IT�S THE WRONG CAR. HE
STAGGERS OVER TO ANOTHER CAR AND TRIES AGAIN UNTIL HE REALIZES IT�S THE WRONG
CAR. THIS GOES ON FOR THREE MORE CARS BEFORE HE FINALLY GETS THE RIGHT CAR, ALL
THE WHILE THE COP IS WITNESSING THIS. THE COP THINKS TO HIMSELF THAT HE IS GOING
TO THROW THE BOOK AT THIS GUY. THE GUY FUMBLES AROUND FOR A WHILE WITH THE KEYS,
IN THE MEANTIME EVERYONE COMES OUT OF THE BAR, GETS IN THEIR CARS AND LEAVE. THE
GUY FINALLY TURNS HIS CAR ON, AND PULLS OUT OF THE PARKING LOT WHERE THE COP
IMMEDIATELY PULLS THE GUY OVER. THE COP PULLS THE GUY OUT OF THE, PUTS THE
HANDCUFFS ON THE GUY, AND READS HIM HIS RIGHTS. THEN THE COP GIVES THE GUY A
BREATHALYZER TEST, BUT IT READS 0.00, AND THE COPS SAYS "HOW CAN THIS BE?, I SAW
YOU STUMBLE OUT OF THE BAR AND TRY YOUR KEYS IN SEVERAL CARS BEFORE YOU FOUND
YOURS, I KNOW YOUR DRUNK." THE GUY REPLIES, "WELL TONIGHT OFFICER, I'M THE
DESIGNATED DRUNK�.