...you know way more about lightbulbs than the average person.
...you buy ten-packs of super glue gel, often.
...there are toothbrushes, tweezers, razor blades, and bone cutters all around the house.
...you have a pile of dirty old frag plugs that you don't know what to do with.
...you keep a special coral graveyard somewhere.
...your house glows blue well into the night.