So to reiterate: A MacGuffin is any "object, event, or character in a film or story that serves to set and keep the plot in motion despite usually lacking intrinsic importance." The entire function of the MacGuffin is to tempt the characters, to give them a "goal," so to speak – something to chase after. It hardly matters what the object is. The focus of the plot should be on what drives the characters to get it, what they do to get it, what happens if they do not get their hands on it.
It can be tough to do the MacGuffin justice. Explain it too much, and you risk losing your audience ("What? These people are risking life, love and limb for this stupid thing and it turns out to be a pack of gum? I'm outta here!"). Explain the MacGuffin just enough to peak your audience's interest, and it's, well, Hitchcock-ian.
Paramount's Mission: Impossible series is a prime example of how to cook up a MacGuffin right. They take the same basic setup as the television series (the Tape Scene, the Plan, and Mission Initiation) then add a modern twist, sending IMF agent Ethan Hunt (Tom Cruise) after bad guys in possession of increasingly treacherous objects. Each object is given a brief description before we're off and running, barely pausing to take a breath or to ask any questions. This is exactly how it should be.





