Here is one from 2015 closed DUST at $15.50 bot at $50 in Dec 2013.
Did not know about price decay of 3Xetf. LOL!!!

Avoid if one can.
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SK OptionTrader Trading Signal: Sell To Close DUST @ $15.15

Current Position:

Long DUST Stock @ $50.10 (5% Allocated). Opened 6 December 2013. Closed at $15.15.

Short GLD Mar 20 ’15 -$122/+$127 Vertical Call Spread @ $1.10 Net Credit (10% Allocated). Opened 30 September

Short GLD Jun 19 ’15 -$113/+$118 Vertical Call Spread @ $2.65 Net Credit (5% Allocated). Opened 7 October

Short GLD Jun 19 ’15 -$113/+$118 Vertical Call Spread @ $2.50 Net Credit (5% Allocated). Opened 2 December

Long DZZ Stock @ $7.23 (5% Allocated). Opened 3 December

Long DZZ Stock @ $6.98 (5% Allocated). Opened 10 December

Short SPY Dec 19 ’15 -$185/+$180 Vertical Put Spread @ $1.30 Net Credit (5% Allocated). Opened 2 February