Why chefs should stay in the kitchen . . .

So we ordered this beautiful glass tile to put behind the main bar as a focal point. No problem about putting it up--Brad and Tony were on the job. Now, keep in mind, glass tile comes covered in a smooth brown paper with the back of the tile exposed. Brad and Tony were perplexed as to what this brown covering was on the "back???" of the tile. So they got to work, and applied the tile to the mortar PAPER SIDE TO THE WALL. Ok. When all the tile was up they got to thinking . . . "what is going to keep the tile from falling off the paper since it's not ACTUALLY adhered to the wall????? With that, they READ THE INSTRUCTIONS FOR INSTALLATION. I think you know the rest.