Here's an interesting one. SRPT, there has been a huge buyer of the Sept 2 12 puts. Paying .15 (and some at .20.) The stock is at 27 with rumors of a drug news coming soon.
So, sell 2 12 puts for .15, buy 1 Sept 2 20 puts for .35. You have only a .05 debit in this and are safe down to 4 on the stock. Very cheap way to play a big downside.
You could also sell a few more 12 puts so you have no debit, or you could buy some higher strike puts so you have more opportunity to make money, say the 24 puts and sell the 12 puts 1x3.