According to the Arizona Tribune:
You accidently enter your password into the microwave.
You have a list of 15 phone numbers to reach your family of three.
You pull up in your own driveway and you use your cell phone to see if anyone is home.
You email the person who works at the desk next to you.
Your reason for not staying in touch with friends and family is that you do not have their email addresses.
You get frustrated when you play solitaire with real cards.
You start tilting your head sideways to smile :)