A GREAT trick you can perform while standing in the coffee line. When it’s your turn to pay, you grab ANY gift card near the register and have the barista scan that card. Naturally, nothing happens
because the card is yet to be activated. You then pull out a $5 bill and rub it on the card. To their astonishment, when they scan the card again, it works perfectly and they have no clue what just hit them. In short, you get a free cup of coffee and blow their minds at the same time.