Women attend a laughter yoga session at a park during a World Laughter Day event in Mumbai yesterday. World Laughter Day which is celebrated on the first Sunday of May, was the brainchild and created in 1998 by Indian physician Dr. Madan Kataria, founder of the worldwide Laughter Yoga movement. The first World Laughter Day gathering took place in Mumbai, in 1998, with close to 10,000 people coming together in a mega laughter session.