Ugo Fantozzi, Filini, Fonelli, Calboni and Miss Silvani are no longer the valiant and unfortunate accountants and clerks of their youth, keen on cheating their company by just pretending to work, or to extreme display of servility such as when performing the role of doormat for the boss.

The hotel barman however offers him a strange concoction of powerful aphrodisiacs and spices, leading to a night of over-the-top, mountain-shaking sex that surprises and overcomes all reticence in Miss Silvani, finally in love.

Having at last regained self-confidence, Fantozzi is about to send his wife Pina an insulting divorce letter, when he finds out by chance that it was only thanks to her care and sacrifice that Miss Silvani had finally capitulated.

He is in the middle of climbing stairs to a church on his knees with a crown of thorns (Like the one who wore Jesus Christ on the cross) and a comically big boulder on his back, when Pina reaches him with sudden good news: the doctor has figured out the wrong diagnosis, which was not for him but for the priest also involved at the cemetery accident and now the leading the same penitence act.

The movie ends with him looking down at his funeral, where his corpse is being brought to the cemetery in a very thin coffin, his ex-colleagues telling his wife how "It's always the worst who go away first", and Miss Silvani, being actually sad for his death, moving up and down her hand over an enormously long candle as if she was masturbating it; She then proceeds to say "It's like i can still see him in front of me!".