Sharpening pencils with teeth

David Rees, the author of “How to Sharpen Pencils: A Practical and Theoretical Treatise on the Artisanal Craft of Pencil Sharpening,” demonstrates sharpening a pencil with a pencil sharpener held between his upper and lower teeth – a stunt inspired by Jimmy Hendrix’s guitar play with his teeth. He warns that those who try to imitate him could suffer from suffocation by the pencil dusts falling on the tongue.