Here's one I don't know how to solve: at work some folks take meetings in the bathroom. They're on their phone, they walk to a stall, do their... business while doing their business, all the while talking and listening, while toilets flush in the background. I understand cultural differences but taking business meetings in the bathroom seems inappropriate under effectively all circumstances.
I worked in a building that shared the floor with a small law office, the number of lawyers that would cruise on in to take a piss while chatting away on their Bluetooth earphones was too high. They would be talking about their client's cases too, no respect for privacy at all.