Originally Posted by Literature
Sounds like a couple having a really bad day. I've never heard this from them. I don't know them. There's a baby crying, too.
What do you do?
Go up there, knock several times. If no answer, shove your shoulder into the door extremely hard and break in. Demand to know what is happening. If you get resistance, cite the "Stand your ground" law and warn them in no uncertain terms you will defend yourself with physical force if necessary.
That is what I would do.