As told to me by the hero of the story... A local preacher incorporates a 5 minute childrens talk into the service every Sunday. The subject of one recent talk was on the differences between Christians and non-christians. He talked about how apple trees can be recognized by the apples growing on them, orange trees can be recognized by the oranges growing on them, zebras by their stripes, leopards by their spots, etc. The children listened intently and quietly. He then postulated that Christians can be recognized by their love for their fellow man, their love for nature, etc. So far, so good the children seem to be following along. To re-inforce the point, he led them in a verse or two of the song " And they'll know we are Christians by our love". Great, the kids knew the song, and sang along willingly. So then we get to the conclusion, and drawing it all together he says "So, now you see, lemon trees make lemon, apple trees make apples and Christians make love..."
(From the "Rest" of RHF)