Following a really good party one night, the hosts decided to leave the assorted bottles and dregs until the next morning. As they staggered downstairs the next day, they found their young children finishing off all that they could find, and looking the worse for wear.
Not knowing what to do, the father suggested taking them out in the car for some fresh air. A traffic policeman, seeing the car going round and round the block for no apparent reason, pulled him over and breathalyzed him... and the meter showed positive.
While matters were being sorted out, one of the children asked the policeman if he could try the Breathalyzer. Again, the meter showed positive.
"Darn," said the policeman, "another faulty meter!" He apologized to the driver for stopping him, and drove off without another word.