Set in the apartment of divorcee Oscar Madison, and if the mess is any indication, it’s no wonder that his wife left him. Felix Unger, fastidious, depressed, and none too tense, has just been separated from his wife, and is looking for a place to stay.  When the clean freak and the slob ultimately decide to room together, it does not take long for the pair’s catastrophic incompatibility to come crashing down on their lives, to hilarious effect.