I've recently bought a new wallet. It gave me the opportunity to dig out all the wanted and unwanted stuff in my old one. I found some unwanted plastic cards.
See how it pops and jumps - http://youtu.be/EpCvYmUK-UE
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Step 1: Material Needed
1. 2 x unwanted plastic cards
2. 1x rubber band
3. some tapes
Step 2: Step 1
Punch a hole at the short side of the cards. I used a paper puncher.
Step 3: Step 2
Tie one of the card by the rubber band.
Step 4: Step 3
Tie another credit card.
Step 5: Step 4
Tap the cards together.
Step 6: Step 5
Tap the other side of the cards.