I loved that pic! I actually use the same technique to get my co workers attention too, but my aim isn't that good so ill usually just aim towards the body haha. I got like half of the office in on "gator boots" haha
Back on topic, I keep the old cards as practice/gaff decks. Its not too consistent but isometimes ill just stick them back in the cabinet and let them sit, I found that after a while they stiffen up enough to use as performance decks again too