For people into movies and genre fiction in general, you may have heard of the term MacGuffin, which was coined by Alfred Hitchcock. It is one of these concepts which I have been obsessing about, both in my own writing venture and in the crime and spy fiction I read. I finally found online the anecdote where Hitchcock explains what it is on The Dick Cavett Show. I had read the story, but never heard it straight from Hitchcock's mouth. I find it fascinating.