Your hair. Scissors, hairdryer and a clean sheet.
Wash your hair and dry it. Put a clean sheet on the floor. Look at yourself in the mirror and check how much the grey roots of your hair has grown.
Cut your hair along the line where the colour changes from the one to the next. Pick the sheet with the cut hair up at the corners and release the hair out your window. Let the wind blow your hair somewhere else; to another window, to the canopy of the trees, to the skins of the passers-by, to the puddles of the streets, to the hair of a dog, to the tongue of a bird.