I believe it was Hitchcock who coined the term, "McGuffin," which is an item in a thriller or crime that doesn't matter but helps move the story along. My favorite McGuffin was the briefcase in Pulp Fiction. There's been a thousand theories on what was in the case. I always thought it was a 1/2 dozen Royale With Cheese burgers. Anyhow, what is your favorite McGuffin?