Roberto Benigni - Il Mostro AKA The Monster (1994)

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Plot Synopsis from allmovie.com
Grossly mistaken identity provides the impetus in this Italian farce. Loris is an anti-social fellow with a high sex drive. During a party he is pointed towards an "easy mark." Unfortunately he approaches the wrong woman. When he discovers his mistakes, he nervously apologizes for the attempted liberties. A run-away chain-saw becomes involved and the frightened woman ends up filing a police report. Her report leads police boss Frustalupi that he has finally found the crazed sex killer the "Mozart of vice" whom Frustalupi has hunted for the last 12 years. Situations go from bad to worse as the police begin surveillance upon Loris whose every action becomes misconstrued by them. Things get even stickier when they put policewoman Jessica on the case as undercover bait.

Review from imdb
Hilarious Benigni., 3 July 2002
Author: tfrizzell from United States

Roberto Benigni's "The Monster" is a laugh-a-second romp that is truly reminiscent of the greater works of Charles Chaplin, Buster Keaton and Peter Sellers. Benigni stars as a loser who works for a mannequin company who unwittingly becomes caught up with the authorities who believe that he is the titled character, a man who has been raping and murdering women all over the city. Naturally, Benigni is not the guy they are after but all the strange coincidences make him appear to be the criminal. Undercover beauty Nicoletta Braschi (Benigni's real-life wife) tries to trap Benigni by enticing him in the most creative ways. The film is great fun, but it is very adult-oriented with sexual situations and innuendos galore. Overall "The Monster" is a really great film and Benigni fans will love it more than most others. Plot resolution late hurts the film, but not enough to keep it from being very successful overall.