"The toucan, which stowed away on a Greek banana boat from South America, carries a unique and highly contagious virus. The virus causes intense feelings of giddiness, happiness, and kindness in anyone affected by it.

Pete initially catches the virus and in an outbreak of euphoria, suddenly senses a purpose in his life."

"The now upbeat collective keep the toucan, nicknaming it "Amigo". They then decide to spread the virus to as many people as they can"

https://en.wikipedia.org/wiki/What's_So_Bad_About_Feeling_Good%3F