You rinse and reuse the plastic bag your brown sugar comes in.
You use both sides of your printer paper.
You reuse junk mail for printer paper.
You use junk mail envelopes for grocery lists (because they hold coupons so well!)
Your idea of a good Friday night date involves a trip to the library, because their DVDs are free.
You have a bucket in your bathtub to catch the "not quite hot enough" water before your shower, and reuse it to flush your toilet or water your plants. (or pour into your washing machine, or water the dog...)
The thought of paying full price for an outfit at the mall makes you slightly ill.
Your refrigerator displays half-finished glasses of juice, labeled with each child's name.
You cloth diaper your children.
Somewhere in your home there is a precariously-stacked bottle of something upside-down on another bottle of something, draining the last bit of something before the top bottle is recycled. (Recycled, of course, because trash bags cost money.)
You know what the last digit is in the final-markdown price of clearance items at Target. (No, I'm not telling you.)
Your children ask (with excitement) when the next yard sale-ing morning is.