Here are a few I am guilty of:
Hitting the "T" key during bootup (about a minute with my lenovo)
On the on ramp to the high way, accelerating to 65 (or 80 :lol

as fast as I can without power-skidding, and letting go of the gas petal at 65, feeling that "head over heels feeling" and calling out "MECO, Houston"
Watching the spedometer for more than 3 seconds during an acceleration to try and determine the g-load, and almost hitting another car (I promise I will be more careful in the future).
Banging my head against the wall behind me in English class to feel heavy g-load on my brain for a split second (OK, my english class is REALLY boring)
Striking up space shuttle conversations with my Calculus and Physics teachers.
Hearing the words "Talyor Polynomial translations" come out of my calculus teacher's mouth and thinking "beep, rotation."
Buying a $60 dollar throttle quadrant from saitek to have main, hover, and retro throttles (pretty good buy, though).
Attempting to learn C++ just to make orbiter addons (Sad attempt, really).
Going fast in reverse, and then slamming on the brakes to feel some eyeballs in G's (in my driveway, of course

)
Attempting to create orbiter for the TI-83 plus (again, sad attempt)
On Golaith (roller coaster), pretending I am holding I joystick and flying a DGIV.