If you're a true movie geek, you probably refuse to dress up at Halloween in anything but a movie-related costume. I guess I'm not a true movie geek, because two years ago I went as Family Guy's Quagmire, who as of yet is not in any movies. Last year, though, I was Harpo Marx. I haven't decided what to be this year yet, but it isn't definite that I'll be something with cinematic reference.
Of course, if I was a real, hardcore movie geek, I wouldn't just settle for the basic, predictable movie-themed outfit. I'd go for the gold, and be an uber-geek. How? I would doubly dress up as a movie character who is dressed up as somebody or something else. To do so, I would pick one of my favorite non-Halloween costumes and disguises depicted on film (it isn't as fun dressing as a character who is dressed up for Halloween). However, most of these would be difficult to achieve -- or at least too obscure to wear to a common party, where the crowd isn't as film familiar as you. If you attempt any of these, good luck! And please, please send me a photo.
1. Harpo Marx and Chico Marx as Groucho Marx in Duck Soup (1933, Leo McCarey)
See, now if I had really wanted to be geeky (or pretentious), I would have not just dressed as Harpo last Halloween; I would have dressed as Harpo dressed as Groucho. In one of the most famous sequences in any Marx Brothers film, Pinky (Harpo) and Chicolini (Chico) each disguises himself as Rufus T. Firefly (Groucho) in order to steal some war plans. The real gem of the sequence, of course, is the "mirror scene" (watch it if you've never seen it before, please), where Pinky pretends to be the reflection of Rufus until Chicolini appears and ruins everything. Although historically it was only Harpo and Chico who were often mistaken for each other, or for twins, all three brothers look so alike here, that when they're all together, it is almost difficult to tell who is who. If you want to pull this double-costume off, it won't be hard -- Grouch faces are easy to do, and then you just need a sleeping cap and gown -- but I doubt you'll get much tolerance when you constantly correct everyone who thinks you're simply Groucho.