When I make #coffee with milk. I first pour the milk then the coffee.
It seems weird, though makes more sense. Since I realized that if I follow the typical route first coffee then milk, more times than not I either burn myself or it is filled to the rim.
This way I have less of a chance of filling it to the rim while getting the desired ratio of coffee:milk.
As an added bonus the mixing is done more efficiently, since the less dense fluid is already present in the cup before adding the more dense one.