Comment by mk_stjames

Stargate, where Daniel Jackson (James Spader) explains to the military officers how he's found that the symbols on the cartouche aren't hieroglyphs, they are star constellations, and that they represent a course from an origin to a position in space, and then following that, he gets shown the gate, where it is explained to him what they think it is and what they are trying to do with it.

It's double sided exposition where the audience gets to just bask in it, and it is brilliantly portrayed.