S&W 642 Pocket Protector
click each image to enlarge
OK, see, the Smith & Wesson model 642 revolver is the most widely sold small revolver in the world, frequently used for self protection and carried in a pants or jacket pocket. So it's a "pocket protector," like the plastic thing Geeks used to use in their shirt breast pocket in case pens leaked. So it's funny, right? Get it? Acrylic disk approx. 5" diameter.