The Trademark: An item of value which is of extreme importance to the characters, who all want to possess it.

Seen In: The ‘Top Secret Plans’ in The 39 Steps, the ‘microfilm’ in North By Northwest, Guy’s Lighter in Stranger’s On A Train, the stolen $40,000 in Psycho.

How To Recreate It: Look around you right now, wherever you are – and pick the first object you see.

The more trivial the item the better. A stapler for example, which has staples made from a top secret alloy or something.

Or just stick with zombies.