While male genitalia started to become a punchline in American comedies at least as far back as "Forgetting Sarah Marshall," there's a case to be made for the gag reaching its full potential in writer-director Patrick Brice's "The Overnight." A scene in which Jason Schwartzman and Adam Scott show off their (allegedly prosthetic) junk in an awkward display of male bravado maintains a terrific slapstick kick — puerile humor at its finest. The moment also illustrates the limited comedic inspiration of Brice's loose, uneven romp, which goes down easy and never digs too deep.