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An alcohol drop can break a surfactant solution film without coalescence, just toutching the surface is enough. I've recorded like tens of thousands of this kind of photos with fast camera. The time interval T_0 between the toutching and the breaking generally related to both 1)the alcohol concentration and 2)the surfactant concentration. The interesting thing is, at a certain alcohol concentration, say 30%, T_0 is short at low surfactant concentrations and becomes longer at intermediate surfactant concentrations, and short again at high surfactant concentrations. And plus, I've also got a lot of coalescence before breaking cases, which of course only make things more complicated. Basically I had no explaination of the whole thing. Send me an email if you have some ideas.