So that's why I carry my coins in one of those little oval-shaped coin "pockets". I got into the habit when I was in Law Enforcement - we didn't want coins jangling in our pockets when movng around in a suspected burglary location. And BTW, the easiest way to flush out the bad guys in that situation is jacking a shell into the 12-gauge's chamber. In a warehouse, it echoes everywhere, and they just won't take a chance with a shotgun pointed their way!
2013 F30 335i M-Sport 8AT/MPE/MPPK, 2016 228i M-Sport Cabrio 8AT