One night a police officer was staking out a particularly rowdy bar for possible violations of the driving-under-the-influence laws. At closing time, he saw a fellow stumble out of the bar, trip on the curb and try his keys on five different cars before he found his. Then sat in the front seat fumbling around with his keys for several minutes.
Everyone else left the bar and drove off.
Finally as he started his engine and began to pull away the police officer stopped the driver, read him his rights and administered the Breathalyzer test.
The results showed a reading of 0.0 The puzzled officer demanded to know how that could be.
The driver replied, "Tonight I'm the designated decoy."
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"For every idiot proof system devised, a new, improved idiot will arise to overcome it."