Bounty for a party to force insurance pool to grow in a given period of time by a fixed amount. (should be easy, the reward should be like 5 DAI, if not completed in a week, double it)
Bounty for a party to force the insurance pool down to zero over a fixed amount of time.
Bounty for a party to force the price to diverge by more than 20% from the spot price for more than say 10 minutes.
Bounty for a party to force repeated auctions resulting in "wild" price fluctuations (outside 99% confidence of risk model) for 5 minutes.