You ask your optometrist about the availability of H-Alpha Sunglasses.
You don't buy a house until you've had a chance to see how dark the
neighborhood gets at night.
Somebody asks you where you live and you tell him the latitude and
longitude of your house.
Somebody asks where your town is and you pull out a map and show him
how to "starhop" from town to town to find it.
Your neighborhood seems to always have more than its share of
non-functioning streetlights and porchlights.
Have you noticed since everyone has a camcorder these days no one talks
about seeing UFOs like they used to.
When you take a new vehicle for a test drive, the first thing you do
is run by home to see whether your telescope will fit in the trunk.
During droughts, farmers in your area collect donations to allow you
to buy more telescope equipment (to make it rain).
All of us could take a lesson from the weather. It pays no attention to
criticism.
Your friends and colleagues tell just you about the beautiful sky they saw
the other night.
You rewire your house to 12VDC so that it's compatible.
A pair of binoculars and a small refractor are always in your trunk,
just in case.
There is a theory which states that if ever anybody discovers exactly
what the Universe is for and why it is here, it will instantly disappear
and be replaced by something even more bizarre and inexplicable. There is
another theory which states that this has already happened.
You can hand-draw your own star charts down to the 7th magnitude --
from memory!
You've named your kids and pets after stars or constellations.