On Sunday morning, the preacher brings in 4 covered jars with one live worm in each. In one he poured whiskey, in one he poured liquid chocolate, in the third one he poured cigarette smoke and in the fourth one he threw in dirt. Result was nothing unusual. Worms in first three jars died. He then looked at the congregation and said, "I don't have to tell much. I believe you have learnt a clear lesson". Then he pointed at a little girl and asked,"Sweetheart, can you tell what have you learnt?". Without any hesitation she said,"If you drink, smoke and eat chocolate you'll never have worms".