Don't forget commodity futures limits [1]. I remember in 2011 when cotton was limit up for days in a row, with the market opening the next day and locking up immediately (and options showing a "synthetic" price much higher).

Limits are subtly different from circuit breakers in that trading can continue... within the limits.

[1] http://www.cftc.gov/industryoversight/marketsurveillance/spe...