"Days of Wine and Roses"
It's an old movie with Jack Lemmon and Jack Klugman and Lee Remmick. It's in black and white. And wow. I highly recommend this movie. The reason I rented it in the first place was because it was mentioned here among others, such as "When a Man Loves a Woman" also one of my favorites, and Leaving Las Vegas which I haven't seen yet.
[ame= ]YouTube - Days of Wine and Roses..Perry Como[/ame]
So, check it out when you get a chance. (Not for the tender hearted)