Someone who, when looking for something in the grocery store, walks up and down the aisles with their "Ctrl-F" fingers twitching. (Yes...I've done that.)
Someone who yells Ka-BOOM in a Scottish accent when they see something ignite.
Someone who has a plan laid out for when the Zombie apocalypse comes. (Admit it - you all do.)
Someone who has a zombie-fighting weapon somewhere in their room.