10-year TIPS Yields Negative
There was some speculation that gold prices would follow the inverted 10-year TIPS yield. With gold prices ~$1800/oz. U.S., that would imply negative yields on the 10-year Treasury Inflation Protected Security. As it turns out, 10-year TIPShave negative yields:

source: http://www.bloomberg.com/markets/rates-bonds/government-bonds/us/