...watching a bar in the hope of catching drunk drivers.
It nears 3 AM and they see a severely intoxicated man struggling to open the door to let himself out of the bar. He's walking in zig-zags all the way to a car in the streets. He struggles to fetch his keys from his pocket and, when he finally gets them out, he again struggles to put the correct key in the door.
By this point several other drunk men have left the bar and drove off but the cops are determined to catch this particular man as he seems the drunkest of the lot.
The drunk gets in his car and - after much fumbling - puts the correct key into the ignition. The moment the car starts up the cops fire up their siren and approach this drunk. They administer a breath test which, to their surprise, is NEGATIVE!
They tell the man that they need to administer a blood test at the station instead.
At the station, the blood test, again, comes back negative. Seeing as how they can no longer arrest the man for drunk driving, they let him go once he's filled in some paperwork.
In the section marked occupation they read the following:
>"Professional Decoy"
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