That was a little topic drift. Someone said that the Godfather was the best movie of all time. I responded "It's in the top two anyway." and then someone asked me what was the other one and I responded "For me? Casablanca."
It's one of my favorite movies of all time as well. It's beautifully made without a wasted scene. Everything in there has a purpose.
Funny thing, before I started attending UConn in the late 1970's, my favorite movie as a teenager before I went to college was probably The Graduate (while it is still a good movie, it is no longer one of my absolute favorites).
I believe I saw Casablanca for the first time as a teenager prior to attending UConn, but I saw it a bunch of times while at UConn. Casablanca was often shown at UConn while I was a student there, as it was presented by film societies at UConn, and also various groups would sponsor it at UConn, as it proved to be a good fundraiser for various dorms and clubs at the school that were trying to raise money. I really fell in love with it during my years there.