You might be a liveaboard if...

• You buy vinegar in gallon jugs. Frequently.
• You glance warily at the house AC ammeter when plugging in your hair dryer
• (And you have a house ammeter)
• You check the tide tables when you are making a big grocery buy
• Lightening scares the bejeezus out of you
• Your stove only has two burners
• You've run out of water in the middle of a shower
• In conversations with your friends, the most common topic is "the head"
• When someone says "head", your first thought is not the one on your shoulders
• The phrase "scrubbing her bottom" does not sound kinky to you
• You can catch crabs from your living room
• "Running out to the car" is a half-mile round trip
• Grid power outages do not particularly disturb your life
• When you get a new book, you have to decide which of your other books to give away
• A successful trip is one where nothing breaks
• You have 300' of chain in one of your closets
• You have more than a passing concern about water in the basement
• You take turns with your partner in passing thru a hallway
• You are hyper-alert to strange sounds and strange smells
• Your have at least one flashlight with a red lens
• The five-second rule is of no value for hamburgers that accidentally get flipped off the grill
• You have a bottle of vegetable oil in your bathroom
• You have to think about keeping the toilet paper dry when taking a shower
• You don't own a toaster
• You always put everything back where it came from, because really, that's the only place it will fit.
• You unthinkingly use "stern" to refer to the back of your car (unless you own a 1966 Lincoln, in which case it is entirely appropriate)
• All of your windows have a water view
• There's a fishing pole stored over your bed
• The terms "amps" and "amp-hours" come up frequently in your conversations
• You have radar in your living room
• You have at least two electrical systems
• A dorm refrigerator looks large to you
• You have no furniture
• You know how many amps your TV draws
• You have 5200, polysulphide and multiple kinds of epoxy in your "junk" drawer
• (And you know what I meant by 5200)
• Your bed is not a rectangle
• "Vitamin supplement" is not the first thing you think of when you hear "zinc"
• For you, "scope" does not refer to mouthwash
• You unconsciously use "port" and "starboard" when talking to folks on shore
• You don't own a plunger 
• You look like a bag lady (or man) just getting off or on your boat.
• Instead of the Goodwill, you have the ice machine in the marina office where you exchange unneeded items.
• You have a supply of tarps to use when you suddenly "spring a leak".
• Your car looks like a storage unit for the local boat yard.

If you have one to add, put it in a comment and I'll pull it into the list...

(Inspired by this list at Windtraveler.  Because, of course, cruisers are also liveaboards, there is a lot of overlap - I have tried not to plagiarize/duplicate...)

You might be a liveaboard if...