What happened in M's office in TWINE?

edited November 2012 in Bond Movies Posts: 4,400
This has probably been discussed before so I apoligise in advance as I couldn't find anything when searching for an answer. In the opening of TWINE when Bond meets M in her office while her and Robert King are talking, when Bond is sipping his whiskey and sees the liuid has gone all foamy he immediately knows something is up. Am I the only one missing something here? How did he know? I'm guessing it had something to do with a chemical reaction but it was poorly explained.

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