Leveraged ETFs can be beast, but the one below is remarkably awful. It's the triple-bearish on real estate symbol DRV. I don't know what the percentage drop is during its lifetime, but it's definitely over 99%.
http://slopeofhope.com/2012/05/the-incredible-shrinking-leveraged-etf.html
The Incredible Shrinking Leveraged ETF
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