So I have a P DEC17 53 position for TARGET in my portfolio. Suddenly this morning it showed an impressive 3050% gain - I thought WTH?? Did TGT go out of business overnight? But then it showed that whereas the bid/ask is like 0.03$/0.06$ there was a transaction done at 0.63$ for a volume of 10. Ouch that must have hurt the person vaporised 90% of his money with one transaction.