It's not on the coin, its in the package...
Ok, I like finding a good die crack here and there. So, I get out my 2005 Legacy set just to check the O! The Joy! nickel. I struck out there, so I start to look at the obverses. I see this shiny line across Jefferson's forehead. Maybe paper thin, but there is something there. I'm thinking, "what a crack!" I twist and turn the coin under different lights.
Turns out I got a piece of hair from one of the US Mint workers going right down Thomas' forehead. Thomas is brown haired, literally. I had to laugh and share (to hard to scan in, I tried).