Saying Make it so in casual conversation.
Indignation because the periodic table doesnt include dilithium and tritanium.
Ability to use variable phase inverter in a sentence without excessive thought first.
More than one pair of Spock ears on junk drawer.
Have figured out the stardate system.
Sudden urge to wear lots of Lycra.
Scanning shelves at local liquor store for synthehol.
The Star Trek theme becomes background music for your dreams.
Major quote sources for thesis are Shakespeare, the Bible, and The Omega Glory.
Memorization of the crews authorization codes.
Forgetting that present-day elevators dont have voice interface.
Attending a convention wearing non-Terran vestments.
Actual serious thoughts about buying that $300 model of the Enterprise from the Franklin Mint.
Understanding Klingon.
Lecturing a science professor on how transporters work.
Playing fizzbin and understanding it.
The Outrageous Okona seems like a fine piece of writing and dramatic stylistics.
Paying rapt attention during those endless special effects sequences in Star Trek: The Motion Picture.
More than three original episode outlines buried in your drawers.
You spend all your free time playing on the IRC #startrek channel, like a giant geek.