My wife and I were watching a movie last night, in which the wife put breast milk straight  out of the babys bottle  in herhusband's coffee.   I don't drink coffee or tea, but I'm wondering if this is a thing among those who do?

I've only noticed something similar in a couple of sitcoms where someone would mistaken breast milk in the fridge for regular milk.

I've used my wife's breast milk in coffee before, it is pretty good. Can't do it very often though, because the baby needs it.