I found one.

One of my hair follicles on my head has lost pigment cells.

While washing my hands in the bathroom just now, a glint in my hair caught my eye. Upon closer inspection I found a hair that has begun to grow in a distinctly lighter color than the rest of my head - not quite gray, but I don't know that I'd call it blond either. The hair itself has been around for a while. It's at least 6 inches long. But the light part is about 1 inch long. So how long does that mean it's been there? I wanted to pull it out to get a closer look at it (and to find out if the root was also light), but I tease Matt about his grays so much that I figured he should get a chance to see it.