Read the passage. April Fools' Days Around the World
April Fools' Day is celebrated around the world, although it varies somewhat from country to country. In the United States, for example, it's a day to play practical jokes. In France, where the holiday is known as Poisson d'Avril, or April Fish, people secretly tape paper fish on their friends' backs. A common April Fools' prank in Portugal is to throw flour on someone; in Scotland, the most popular trick involves sending someone on a useless errand. Denmark celebrates April Fools' Day on April 1, but some people there celebrate again in May. Maj-kat, on May 1, is yet another day for jokes and pranks in the spring.
What is the main idea of the passage?

Though there are variations is how differences in how different countries observe April Fool's Day, the celebrations all involve playing pranks.

On Poisson April, France's version of what Americans call April Fool's Day, pranksters tape paper fish to people's backs.

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