I have since watched more Matthau films.
Plaza Suite (1970) - Is a movie which consists of three parts, all taking place in the same room (719) in a lavish, luxury hotel. The first act stars Matthau (as Sam) and Maureen Stapleton (as Karen) as a married couple, whose marriage is beyond predictable and stale. Karen is dingy, confused, aloof and melodramic. She tries desperately to have a romantic filled anniversary. Saying that she "over-does it" an understatement. You can feel Sam's frustration with her ridiculous behavior. Sam points out her flaws and her stupidity, and she laughs everything off and stands up for him one minute, then eggs him on the next. When it's later revealed that Sam is having an affair with his secretary, I got a huge sigh of relief. Hell, with a wife like Karen, you can hardly blame him, even though we are led to feel "sorry" for her. I won't be led down that path with over bearing acting!!!
The second part is probably the weakest of the three. I may have liked it more if it wasn't for Matthau's distracting toupee. Matthau plays a famous Hollywood producer, who comes back into NYC and has only 2 short hours free to himself, due to his busy schedule. So he decides to fill this time trying to get poonany. He calls an old girlfriend "Muriel Tate" over to his hotel for drinks. She arrives thinking that she's only going to say hi and leave, but its obvious she is still obsessed with her now famous ex-boyfriend. Of course, he is filling her head with nonsense, ANYTHING to get down her pants ... even telling her about wife #3's most recent lover {I'm paraphrasing here}
"You know the famous actor who's initial's are A.W?"
"Why yes, was that her lover?"
"No, his wife. I married a faggot!"
Third installment was definitely the best, but not by much. Matthau plays a tight-wadded, wealthy, obnoxious business man who's daughter is getting married that very afternoon, but ends up locking herself up in the bathroom to avoid her walk down the aisle. He goes through all sorts of schemes in order to get his daughter to marry, because, dammit ... that wedding is expensive!!!