When two objects at different temperatures touch, heat flows from the warmer one to the cooler one. This makes the warmer object cool down, and the cooler object warm up. Heat continues to flow until their temperatures have become equal.
This happens in my bed, when my wife's cold feet touch my warm ankles. In that situation, this basic law of thermodynamics often seems violated, as her cold feet totally suck ALL of the heat out of mine, yet they still seem to remain cold.
