Business cards: They can be simple, they can be flashy, they can even be metal, but with unusual-looking business cards two-a-penny these days, you've got to go one better.

Your card can't just be a card. It has to have some other use, too -- like the stainless steel fella on the left, which includes a detachable cutlery set.

We've gathered together the best in functional business cards for your inspiration and astonishment, including one that turns into a catapult ... and another that fires pennies.

No, really. Honest.

Card: Stress-relieving stretchy business card
Owner's Occupation: Personal trainer

Card: USB drive business card
Owner's Occupation: Web designer

Card: Lockpick business card
Owner's Occupation: Security consultant

Card: Whoopie cushion business card
Owner's Occupation: Clown

Card: Condom business card
Owner's Occupation: Divorce mediator. No, really.

Card: Knife, fork and spoon business card
Owner's occupation: "Culinary correspondent"

Card: Wrench business card
Owner's Occupation: Web coder, as it turns out

Card: LED business card
Owner's Occupation: Not sure, but doubtless someone very geeky

Card: Clothes peg business card
Owner's Occupation: Clothes designer

Card: Domino business card
Owner's Occupation: Coal and wood salesman, obviously

Card: Ruler business card
Owner's occupation: Not the foggiest. Tailor?

Card: Toothpicks/mirror business card
Owner's Occupation: Dental hygienist

Card: Bottle opener business card
Owner's Occupation: This one could be anyone's. Everyone's, even.

Card: Sugar packet business card
Owner's Occupation: Photographer / graphic designer

Card: Musical comb business card
Owner's Occupation: Rock n' roll–themed hairdresser. Seriously.

Card: Cracker business card
Owner's Occupation: Personal trainer


And finally ... the "Penny Shooter" business card:


Don't forget the "Cardapult" business card: