If you like to eat, at some point you are going to need to cut stuff up. You could use your knife right on the countertop, but then your wife will gripe at you about annoying stuff like germs and nicks on the counter. What you need to avoid getting yelled at and to cut up that perfectly cooked steak is a cutting board.
You could get a lame plastic one down at Walmart or you can get the Awesome Mix Vol. 2 cutting board, courtesy of Marvel’s Guardians of the Galaxy merchandising folks.
This thing measures 12″ x 8″ and is made from glass, so it’s heat resistant up to 350-degrees, and won’t retain germs. It will let you slice and dice like Star-Lord probably would if Marvel heroes ever ate other than in post-credit scenes. You can get one on ThinkGeek for $14.99(USD).