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 patron stumble out of the bar, trip on the curb and try his keys on five different cars before he found his. The guy then fell onto the front seat, pulled himself up, and continued to fumble around with his keys for several more minutes. Everyone else had left the bar and driven off before he finally started his engine and began to pull away.

The police officer was waiting. He stopped the driver, read him his rights and administered a Breathalyzer test. The results showed a reading of 0.0. The puzzled officer demanded to know how that could be.

The driver replied, “I’m the designated decoy.”