Tom, I've opened a 3-pack of Sam's ribs before, and found one of the racks already skinned! Most of the time, they are not. Best method I've found is one I learned in a Jeff Philips email. Start in the middle by working a butter knife from edge to edge and creating a pocket. I've found doing this directly over a bone helps a lot. Once you create the pocket, grab it from both sides, with your fingers, and lift (like picking up a suitcase). Hold the ribs down with your free hand. The silver skin comes off from end to end, in one piece! I can skin 3 racks of baby backs in about 2 minutes!