monsters having fun, happy, happy
see them jump and run, happy, happy
laughing all the while, cheerful, cheerful
flashing a big smile, that's a per-fect sign
that they're feelin' fine

(mike) furry happy monsters feeling glad
(kate pierson puppet) furry happy monsters feeling glad
(michael) furry happy monsters laughing

something has gone wrong, sighing, sighing
faces have turned long, crying, crying
hear them sob and whine, tearful, tearful
that's a real good sign that they're feelin' glum
sad, sad times have come

(same order as before)
furry sobbing monsters feeling sad
furry sobbing monsters feeling sad
furry sobbing monsters crying

michael: come on monsters, you don't have to cry! monsters: no?
michael: no! we can be happy!!!

furry happy monsters feeling glad
furry happy monsters feeling glad
furry happy monsters laughing
furry sobbing monsters feeling sad
furry sobbing monsters feeling sad
furry sobbing monsters crying
(glad and laughing again)
monsters, happy monsters
monsters, happy monsters