In the pre-title sequence, there is mention of something called the “Rabbit’s Foot”. Ethan needs to get the Rabbit’s Foot and bring it to Davian. In this clip, this scene, Benji speculates about the Rabbit’s Foot, even describing it as the anti-god.

The Rabbit’s Foot is a MacGuffin. Although many of you will know this term, others might not.   A MacGuffin is a device used in a story which serves as the driving force for the action. It often has no explanation as to what it is. Its definition isn’t important to the plot.   Just its existence is. Alfred Hitchcock’s The 39 Steps was one of the first spy films to use a MacGuffin, but many more films use the MacGuffin as a technique to have something upon which to base the action of the film. Some examples include the briefcase in Pulp Fiction and Ronin, the Holy Grail in Monty Python and the Holy Grail, and the statue in The Maltese Falcon. J.J. Abrams uses MacGuffin’s in “Alias” as well with the Rambaldi Artifacts.