DVDs weren't out yet, so please ignore my box set
The hundred movies meme was even harder to assemble because I spent far more of my childhood and adolescence immersed in books than in movies and therefore many of the films on this list were not so much formative as illuminating once I finally started paying attention to cinema as an art form, and/or they wired themselves instantly into my brain and are quoted regularly to this day. A list of favorites might overlap significantly but not identically, I imagine tilting more heavily toward sff and noir. I feel it may be a much more mainstream list than my formative books, although still full of meaningful absences. (I sacrificed a number of classics as well as movies whose circumstances were potentially more important than their content, but just glitched on The Medium (1951) and Katerina Izmailova (1966), both of which I even own.) I find it very difficult to try to winnow accurately. I may just not be designed for this format of meme.

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1. I was surprised by how much I liked 8 1/2 and Amarcord after earlier mildly enjoying La Strada and Nights of Cabiria; did not like Juliet of the Spirits. In general, European films like those and Shoot the Piano Player and Day for Night have been very pleasant discoveries. 2) I was shocked at how good I Am a Fugitive from a Chain Gang was! 3) I didn't expect to like Charlie Chaplin as much as I did; City Lights is absolutely essential. 4) A lot of the films from the 2000s on the list shouldn't be there, IMHO; a lot of those entries are either pretty lightweight or just not very distinctive.
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I am not sure I have ever seen it! But it is a pre-Code, and I will give almost any one of those a chance. It has served me well more often than not. Thanks for the more than generically famous rec!