Busy Status Bar

I got a giant usb-controlled traffic light at my first job in Germany for a customer project. They just let me keep it after the project finished, which made me repurpose it as a busy light and it worked wonders except that one person who didn't get the hint.

Not exactly this but close: https://www.cleware-shop.de/USB_Tischampel_360

Jerks and dorks disrespect others, with the differentiator being intention. If they don't get the hint, then it's probably time for a teachable moment or assertion of boundaries.