MEME REFERENCE

Kramer, what's going on in there

Use when alarming, bizarre, or chaotic activity is clearly happening nearby but remains hidden from view.

What it expresses: An observer confronts someone at the boundary of a concealed disturbance and demands an explanation.
Example: Your neighbors' renovation produces a crash followed by cheering, so you message a friend with this reaction.
When not to use it: You can see the routine activity clearly and already know its cause; there is no mysterious 'in there' to question.