The Rocky Horror Picture - I can recite every line and even the call backs for it. I must have watched it with my best friend a thousand times. When we became friends when we were 14, some how Rocky Horror came up and we bought the movie and just obsessed on it for 5 years.
The other would probably be The Labyrinth, The Jungle Book, and Yellow Submarine.
The Jungle Book was my favorite movie as a child and I watched it none stop.