A famed trader known as '50 Cent' is making a big bet that the world's worst-performing currency is about to surge 'violently'

• Ruffer Investing has big positions in the Japanese yen, the world's worst performing currency.
• Though the fund cited poor performance this year, it expects the yen to appreciate "violently."
• Ruffer is known as the "50 Cent" fund for its profitable bets made in the volatility market.

Ruffer Investing, whose winning bets in the volatility market earned it the nickname "50 Cent," is betting big on the world's worst-performing currency: the Japanese yen. 

The yen has fallen over 14% this year, representing a major driver behind the UK fund's poor performance. But Chairman Jonathan Ruffer said in a letter earlier this month that he expects a major reversal.