What's the greatest chase scene in all science fiction and fantasy?

Science fiction and fantasy are full of heroic quests and bad guys who want something badly — and often, this leads to people chasing each other. In space, in the air, on the ground, under the sea... But what's the most thrilling chase scene of all science fiction and fantasy?

Please include a picture or clip (or book cover) for your chosen chase scene... and please let us know where it comes from. Thanks!

Top image: The Fifth Element.