A point I think I am not getting across: I am limiting this strategy to when volatility spikes occur--and I think we all can recognize a volatility spike. I do not believe this is a strategy to be placed routinely without thought. If placed at a volatility spike, it has a much greater chance of success. For example, on February 8th of this year, volatility spiked. The high was 27.11. The s&p 500 emini closed at 1056. The day before, if you were keenly watching the vix, the emini put in a low around 1040. So, suppose one placed a reverse call calendar spread at 1055 (buying the April 1055 call and selling the June 1055 call). I probably would have exited this spread last Friday (Feb 19), the latest. On Friday, the vix closed around 20, and the emini closed at 1106. So, the vix decreased by a little over 25% and the emini increased by about 4.2%. I would guess that the spread would have been profitable. I certainly wouldn't place a reverse call calendar spread now, given the relatively low vix (compared to the last six months).