Three teachers meet in the pub and get quite drunk.
As the first teacher, a university lecturer, leaves the pub, he is arrested by two policemen and has to hand over his driver's license. He then rejoins the other teachers to continue his drinking spree .
Then the second teacher, a college professor, leaves and he also is arrested by the same policemen and loses his license. He decides to go back into the pub to continue his boozing.
Finally the third teacher, who works at at a school for special needs children leaves, however returns a few minutes later with the two driver's licenses of his colleagues and says: " You see, it pays if you know your former pupils "
