Tomorrow is April Fools' Day and it's celebrated around the world.
Yes, we typically celebrate by playing practical jokes on friends and strangers alike. Pranksters in other countries celebrate April Fools' Day too…but differently. Sometimes the news media gets involved. For instance, the BBC once ran a detailed documentary about "spaghetti farmers" in Switzerland. Viewers were fooled into thinking they could harvest spaghetti from trees.
In Scotland, it is actually celebrated for two days. The second day is called Taily Day and is devoted to pranks involving a people's rear ends. The origin of the "kick me" sign can be traced to this observance.