World Laughter Day has been celebrated in Iran. World Laughter Day takes place on the first Sunday of May of every year.
World Laughter Day was created in 1998 by Dr. Madan Kataria, founder of the worldwide Laughter Yoga movement. The celebration of World Laughter Day is a positive manifestation for world peace and is intended to build up a global consciousness of brotherhood and friendship through laughter. Its popularity has grown exponentially with that of the Laughter Yoga movement now counting thousands of Laughter Clubs in more than 72 countries.