A mother saw her three-year-old son put nickel in his mouth and swallowed it. She immediately picked hime up, turned him upside down and hit him on the back, whereupon he coughed up two dimes. Frantically, she called to the father outside. "Your son just swallowed a nickel and coughed up two dimes!What shall I do? "Yelled back the father,"Keep feeding him nickels!"母亲见三岁的儿子将一枚五分镍币放进嘴里吞了下去，她立刻将他抱起，头朝下不停地拍打他的后背，他咳出了两枚一角的硬币，她发狂似的朝正在外面的孩子父亲喊道： “你儿子刚才吞下了一枚五分镍币，可咳出两枚一角的硬币！我该怎么办呢？”孩子他爸大声回答道：“再喂他几枚镍币！”