I add
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You have had little milk.
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Especially for the children of this century, I remind you that in the USSR sold a device called the milk guard. In real, it is a metal foam, which lay on the bottom of the pot and began to drizzle during the first stage of boiling, before this your "ah th $#@!" %)
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Not precisely the sound signal to alert, but also the vibrations to beat down your pen, so as not to escape. Yes, and so that milk does not spoil longer, a piece of sugar was thrown into it, so it will not slip in the refrigerator for 2 days longer.