You think your salary remained constant even if it's not keeping up with inflation - because the consumer price index always overstates actual increases in living costs!
You think a game is an analytical tool popularised by John Nash.
You see finding a job as just another matchmaking exercise.
Your grocery list is seasonally adjusted for relative prices.
You try to calculate your kid's discount factor by promising different amounts of candy after dinner to see how much of it is worth one chocolate bar before dinner.
You carpool, but not because of environmental concerns. There are economies of scale involved.
You think a lemon might go sour just because you don't know enough about it.
You correctly predicted four out of the last two recessions.
You secretly think that lightbulbs should screw themselves in. (Corollary: Even if you don't agree with this statement, if you got the joke, you're still probably an economist.)
You think the .pdf in Acrobat files stands for "probability density function".