If you were tasked to try to lose as much money on stocks as possible in a single week, how would you do it?

Any methods are allowed here. They just have to be purely from the stock market. Whatever percentage of money that you lose in one week, you will immediately gain back the next week. So in this case, if you make 10,000$ go to 8,700$, next week, you will have a 13% increase in the balance which will give you 11,300$.

How would you do it?