Oh, how could I forget "Un chien andalou"  
The opening of Rosetta was really great, it's probably one of the ten best opening scenes I've seen. But the rest of the film didn't keep this up, though I liked it.
The opening of Mirror, also my favorite part of the whole film, and "Andrei Rublov" you probably mean the edited version, where you aren't introduced to the men. Great indeed.
Forgot to mention the beginning of "The Red and The White", or how about "The Good, The Bad and the Ugly"?