April 1 In sixteenth-century France, the start of the new year was observed on April first. It was celebrated in much the same way as it is today with parties and dancing into the late hours of the night. Then in 1562, Pope Gregory introduced a new calendar for the Christian world, and the new year fell on January first. There were some people, however, who hadn't heard or didn't believe the change in the date, so they continued to celebrate New Year's Day on April first. Others played tricks on them and called them April fools. In France today, April first is called Poisson d'Avril. French children fool their friends by taping a paper fish to their friends' backs. When the young fool discovers this trick, the prankster yells Poisson d'Avril!
愚人节16 世纪的时候,法国人是在4月1号庆祝新年的。他们那时候过新年的方法和我们现在几乎一样,人们设宴、跳舞直到深夜。到了1562年,教皇格里高利颁布了基督教新历,按照新历,新年这一天改到了1月1号。但是,有些人没能听说或者听说了但不相信新年改天了。他们还是按照老习惯在4月1号这天过年。其他人就拿他们开玩笑,把他们叫做“愚人”。如今,法国人把愚人节叫做“上钩的鱼”。法国孩子会在朋友的背上贴一条鱼,以此来戏弄别人。当那个受骗上当的小朋友发现以后,开玩笑的人就大叫“上钩的鱼儿”!

Today Americans play small tricks on friends and strangers alike on the first of April. One common trick on April Fool's Day, or All Fool's Day, is pointing down to a friend's shoe and saying, Your shoelace is untied. School children might tell a classmate that school has been canceled. Whatever the trick, if the innocent victim falls for the joke the prankster yells, April Fool!

Most April Fool jokes are in good fun and not meant to harm anyone. The most clever April Fool joke is the one where everyone laughs, especially the person upon whom the joke is played. American humorist Mark Twain has said that the first of April is the day we remember what we are the other 364 days of the year.