I'm reminded of a Woody Allen movie (which I can't remember the name of). It had the 4-5 subplots/different characters, the one being a random man from nowhere

I'm reminded of a Woody Allen movie (which I can't remember the name of). It had the 4-5 subplots/different characters, the one being a random man from nowhere who suddenly (and for no real reason) becomes a giant celebrity. Everyone suddenly wants to know his opinions on everything (and/or to get to know him much much better). That continues until after a while they pick someone else, and he just goes back to being a random nobody. I believe he was called Mr. Pisanello (or some such); the movie also featured Penelope Cruz playing a prostitute, accidentally pretending to be a man's wife.