Poul Nielsen, a personal trainer, has created these awesome elastic business cards. You can't read the card unless you stretch the elastic. Then
34 Badass Business Cards
Stretching Business Cards, Stretching Business Card Maker
5/10m Cord Elastic Rubber Bands 1/2/3/4/5mm White Black Stretch Elastics Rubbers
Square Business Cards – BallesterosPrinting
Elastic Business Cards: Stretch the Rubber Business Card to See The Info
Raised foil business cards. Soft touch finish, Colored art extra hard – BcardsCreation
Good firm stretch and count per pound These rubber bands are good for industrial applications and everyday office use Made in USA 1 lb. box
Alliance Rubber Company Rubber Bands (ALL26325), Tan
1-10PC Gorilla Elastic Stretch Monkey Funny Tricky Squeeze Toy Simulation, Rubber
Elastic Business Cards: Stretch the Rubber Business Card to See The Info
Stretching Business Cards, Stretching Business Card Maker