You will need:
- A store card/club card you no longer need (don't use credit cards, it's not the safest thing to use, just in case you lose it)
- a pen/pencil/chopstick
- drillbit/exacto knife/hole punch
First, find an expired club card or store card of any kind (the example uses a Duane Reade Dollar Rewards Club card) or ask your coworkers for one. You can then use either a hole punch or a drill-bit or exacto knife, or really anything sharp that you can get your hands onto puncture two holes on either side of the card. Do this about one hole diameter away from the card's edge so you can have maximum endurance and the 'clip' won't break. If you have lots of hair, you should punch the holes in opposite corners of the card so that using it on the diagonal will hold more hair. Then you will need either a pen, pencil or chopstick, or really anything that will work to punch through the clip and to hold your hair in place, a ball-point pen works wonders, just make sure you use something that won't bleed ink into your hair.
Put your hair into a bun, twisting and looping it around to accommodate this type of hair clip, use one hand to hold onto your hair and the other to place the card around it, then shove a pen through both holes, making sure it passes through your hair and your card will curl around your bun, holding it snugly in place.