This is a fun trick to perform on your friends, anywhere. First, explain to your buddies that your deck of cards is special and acts just like an ATM. They'll naturally be confused and ask you to prove it. That is when you take a low number card from your deck, swipe it, and turn it into a card worth twice as much!
Don't think its possible? Well, have a look at this tutorial and learn just how easy it actually is. Your friends will be completely amazed and want to see it over and over again.