The invisible hair, also known as "the phantom hair," is the hair that has fallen off of your head and is now stuck to your shirt. You can feel the hair brush against your armpit area or the back of your arm periodically, but when you go to take it off, there is usually nothing there (that you can see). The invisible hair normally requires an extra pair off eyes and hands for removal.

When you eat dirt for the first time and leave your family to build a shack in the woods