Never seen it either. Nor have I seen Gone With The Wind or Citizen Kane. Can't say I have much interest to see any of them.
Now THOSE I've seen. While I liked them well enough, I don't see why they are considered classics though.
Not only have I seen both "Casablanca" and "Gone With The Wind", I've watched them on the big screen. In fact, for the latter movie I deliberately waited several decades until I could catch a Fathom Events showing at a local theater — rather than just watching it on TV. It makes quite a difference in your viewing experience ... could even affect whether you consider it a classic.
I'm a film fanatic (nutcase) and took a few film classes in college, so I've seen ALL those movies and then some.
I don't snore...I purr with the force of 10,000 kittens. (actually my college roommate once recorded what was supposedly me snoring. I dispute this. I'm convinced he'd somehow gotten hold of a recording of a tank brigade.)
When I was a kid I enjoyed both ceramics and Star Trek. And that led me to attempt making phasers out of solid clay, the kind you kiln bake with glaze on it. The more "primitive" looking hand phaser (above, with the type II phaser) was once accidentally left at a friend's house. His mother thought it was a door to a clay house.
I have practically not seen any of the American classics like "Casablanca", although I know most of them by reputation and I can discuss most of them... I have sort of a Cliffnotes kind of knowledge of them. I also know Cliffnotes by reputation only as we have no such thing in France...