i was in mixed company a few days ago and was shocked to learn that i was the only one who got (my own) reference to Casablanca. i try not to be prescriptive about cultural knowledge, but at the same time i greatly enjoy understanding cultural references, and have found that Casablanca is one of the richest source of them.
you really should see it for yourself, but i'm collecting a few key clips below.
here's lookin' at you, kid.