What's So Bad About Feeling Good?

What's So Bad About Feeling Good? is a 1968 American fantasy comedy film directed by George Seaton and starring George Peppard and Mary Tyler Moore.

The film opens with a former advertising executive who has become a misanthropic artist, following a Beatnik–Bohemian lifestyle in a commune which caters to the needs of melancholic people who are waiting for the end of the world. A toucan arrives in New York City as a stowaway in a Greek boat, enters the commune and spreads a contagious virus which causes intense feelings of giddiness, happiness, and kindness. The artist is infected and he feels a purpose in his life for the first time. He decides to infect his girlfriend, the entire commune, and most of the population of New York City. He unintentionally destroys the city's economy, because the infected residents suddenly stop buying alcohol, tobacco or drugs. New York's stock exchange and its business districts are about to collapse because the infected are not in the right state of mind to operate them. The political leaders approve an urgent vaccination program to turn New Yorkers back to their natural nasty behavior.