A young boy was having a hard time pronouncing the letter ''R,'' and all the other kids were teasing him about it. To help him out, the teacher gave him a sentence to practice at home: ''Robert gave Richard a rap in the ribs for roasting the rabbit so rare.'' A few days later, the teacher asked the boy to recite the sentence out loud. The boy nervously replied, ''Bob gave Dick a poke in the side because the bunny wasn't cooked enough.''