In the 16 th century, people celebrated New Year's Day from March 25 to April 1. In the mid—1560s King Charles IX changed it from March 25 to January 1. But some people still celebrated in on April 1, so others called them April Fools.

　　各国愚人节对“愚人”的英文称呼Each country celebrates April Fools' Day differently.

　　法国愚人：April FishIn France, people call the April Fools “April Fish”. They tape a paper fish to their friends' backs to fool them. When he or she finds this , they shout “April Fish!”

　　英国英格兰愚人：noodleIn England, people play jokes only in the morning. You are a “noodle” if someone fools you.

　　苏格兰愚人：April GowkIn Scotland, April Fools' Day is 48 hours long. They call an April Fool “April Gowk”. Gowk is another name for a cuckoo bird.

　　美国愚人：April FoolIn the America, people play small jokes on their friends and any other people on the first of Aprol. They may point down to your shoe and say, “ Your shoelace is untied.” If you believe them and look down to see, you are an April Fool then.