I was at the electronics department of the supermarket near Casa K. I noticed this bald headed man screaming at the top of his lungs. He noticed me, said "hello" and carried on with what I was quickly classifying as caterwauling. I didn't know why he was doing this. I was hoping he could stop so I could look for my hdmi cable in peace. But he persisted in screaming, presumably, because he wanted to be served by someone in the electronics department. I noticed some clerks looking at him but not giving him any assistance.
Eventually, a store staff person, who looked to be senior in responsibility, dealt with the customer.