Paul Allen (played by Jared Leto) was Patrick Bateman's arch-enemy and body double in the film version of Bret Easton Ellis' American Psycho, directed by Mary Harron.
In the book, however, the character's name is Paul Owen.
Regardless, in both mediums Paul mistakes Patrick Bateman for Marcus Halberstam, who is also employed in Mergers and Acquisitions at P & P. Being that Patrick does not particularly enjoy the company of Paul, (he is far too much like himself.. and Marcus) he opts to indulge in a fantasy murder involving plastic wrap on his furniture, newspaper, a chair, an ax, and in the movie, Huey Lewis and the News' Hip to Be Square.
"There's no blood at first, no sound either except for the newspapers under Paul's kicking feet, rustling, tearing. Blood starts to slowly pour out of the sides of his mouth shortly after the first chop, and when I pull the ax out -- almost yanking Owen out of the chair by his head -- and strike him again in the face, splitting it open, his arms flailing at nothing, blood sprays out in twin brownish geysers, staining my raincoat."
Ellis, American Psycho