It doesn't "do" wood.---------------------------------------------------Donna: "Sonic it! Use your thingy!"The Doctor: "I can't. It's wood!"Donna: "What, it doesn't do wood?!"[Series 4, Episode 8 - Silence In The Library]*Thanks to 'For-Certain' ( [link] ) for the use of her awesome Sonic Screwdriver vector drawing!***EDIT 27-Sep-12: Small (but essential) punctuation adjustment.