April Fools' Day - 1　　　　　(2)

The first of April is commonly known as April Fools' Day, and it is customarily on this day to play a trick on[1] a friend. If your friend falls into the trap, then he or she is an April Fool.
It isn't only children that like such jokes. Grownups like such pranks, too.
Even the media occasionally try to deceive the public with a clever April Fool story. Some years ago, for example, a famous joke was played on the radio. A scientific correspondent[2] reported that strange geological changes had resulted in[3] weaker gravity in different parts of Britain. He asked listeners to jump up and down and see if they could jump higher than they normally could. Many people did. The hundreds of calls the BBC received proved how successful the hoax was. Not until twelve o'clock did the BBC gently remind its listeners it was April Fools' Day that day.
Making jokes only lasts until the noon of the day, the rule is rigid and everywhere acknowledged. Anyone who tries to make a fool after midday is a bigger fool than he who has been fooled. The late trickster is instantly rebuffed[4], as a piece of poem goes:
April Fool's gone and past
　　You're the biggest fool at last.
　　When April Fool's Day comes again
　　You'll be the biggest fool then.