Replacing a Button for Only 10won (about $0.01 USD)

What do you do when the button comes off of your favorite pair of pants and you don't have a spare? Throw them away? Steal a spare button from something else? Buy brand new buttons? There is a better* way, and it only costs 10won (or 1 cent USD)!
Here is Korea, the washing machines kind of suck, they take forever and they seem to cause a lot of damage to clothing, and the dryer is even worse (I usually hang my clothes outside to dry though). One thing that the washer constantly does is rip buttons off my cloths, not sure why it happens, but it does. Its no big deal though, because I found a great way to replace missing buttons without even having to go to the store.

Step 1: Ingredients

Gather some things that you will need. They are listed below:
10won (or 1 cent)
Some string (I used some that I found lying around, can't figure out where it came from)
A sewing needle
Hammer
Small nail
Scrap wood
White vinegar (optional)

Don't worry, I know that hammers and nails cost more then the budget for this project, but you will be able to return everything to where you found it at the end, only the money and string will be used, the scrap wood may be slightly damaged, but not very much. The vinegar (if you use it) will be dirty, and therefore shouldn't be used for cooking afterwards, but can still be used for cleaning.

Step 2: Clean Your Money (optional)

Depending on your aesthetic tastes and your clothing style (and hygiene related phobias), you may want to clean off your money first. This is quite easy, just take your coin and let it soak in some vinegar for a little while. Soon it will be all shiny. Once its shiny and clean enough for you, take it out of the vinegar and let it dry.
All done, time for the next step.

Step 3: Making the Button

Now what you need to do is take out your scrap wood and place your coin on top of it. Now, get out your hammer and nail. Carefully place the nail on top of the coin, just a little bit off-center. When you feel like your placement is good, give it a good hard whack with the hammer (hit the nail, avoid hitting your fingers, cause that hurts). If all went well, the nail should have poked a hole through to the other side of the coin. The side that is facing up now will probably be the side which faces out, unless you want sharp edges facing outwards.
Now you must repeat this step at least once more, but I suggest you make at least 4 holes total, forming a square around the center of the coin. You should make all your holes are facing the same direction, otherwise you might have sharp edges facing outwards (this might be desirable to you, I don't know). 
Anyways, on to the next step.

Step 4: Sew It On

Simple enough, get some string, thread your needle, and sew it on, just like you would any button.
I used some string that I found lying around in my room, its slightly shiny and gold colored, its also a bit thicker than normal thread, which I figured was a plus (proactive defense against the washer). I really can't figure out where it came from, since I only own purple thread, and I have no fabric that is that color, its quite puzzling. Once again, I recommend using the side without sharp edges as the outside.
If you aren't sure how to thread a needle (its not hard), sew, tie knots, or sew buttons on, then there are plenty of other instructables dedicated to those subjects. To be honest, I really don't know that kind of thing either, everything I know about sewing came from an instructable.

Step 5: Put Your Clothes Back On

Now that your button is sewn on, you can safely wear the article of clothing that you just repaired.
Also, be sure to return your tools to their original location.
That's it, you are finished. Hopefully you enjoyed defacing currency and making yourself a shiny new button for your clothes.