Movie plot security contest

Bruce Schneier is having a contest:

But if we're going to worry about unlikely attacks, why can't they be exciting and innovative ones? If Americans are going to be scared, shouldn't they be scared of things that are really scary? "Blowing up the Super Bowl" is a movie plot to be sure, but it's not a very good movie. Let's kick this up a notch.

It is in this spirit I announce the (possibly First) Movie-Plot Threat Contest. Entrants are invited to submit the most unlikely, yet still plausible, terrorist attack scenarios they can come up with.