ThinkGeek Interactive T-Shirts

These might be old news to you -- but did you realize there were so many kinds? T-shirts that let you play the guitar, that detect wi-fi signals, that have microphones, and that can even sense other interactive T-shirts? Sure, it's just a geek novelty now, but for only $20-$30, soon this stuff will find its way into pop culture... how about a shirt that detects when you are near a facebook friend? Or one that lets people become facebook friends just by bumping shoulders? Or a shirt that connects to a pedometer to show how far you've walked today? Or a shirt with a camera that shows a picture of where you were 15 minutes ago? Or a shirt that tells how long since it's been washed? A shirt that lets your friends play pac man or tetris by touching you? A shirt that displays the top of your twitter feed? Or shows the status of your farmville farm? Or your virtual pets? Or your actual pets... remember your actual pets? Or a shirt that sounds an alarm when you spill something on it? Or a shirt that shows the level of your WoW character? Or...