Because thingiverse can never have enough bottle openers...Here's an openscad wall mountable penny bottle opener.The scad file is parametric though you'll have to play around to see what works. It's not commented at all and rather poorly written...There is now a first attempt at a version with a tongue and eyes. I haven't printed it though. You can turn it off and on with a boolean in the scad file.Print it out, clean if necessary. Insert penny (you may have to squish it in with pliers). The last version I printed out was a bit too tight so I made the hole a bit larger. Hopefully it isn't too large. I haven't printed it out yet.Screw it to the wall (or whatever).You'll want pretty secure screws since there's quite a bit of force trying to rip it off the wall.