…and sometimes you should feel like using a nut.   From Lifehacker:

The folks at Apartment Therapy know a thing or two about making an almost-perfect piece of furniture perfect, and according to them, a walnut under the right circumstances can buff out a ding in vintage wooden furniture with the best of ’em. The simple method, in, *ahem*, a nutshell:

  1. Identify areas of your wooden furniture that are unsightly because they have been bumped or scraped.
  2. Get your walnut.
  3. Rub the walnut on the damaged area.
  4. Watch in amazement as the damaged area begins to darken.
  5. Step back and admire your work. Hey, you didn’t even break a sweat!