There's someone who lives on my road called Michael. He lives on the the second floor of a big old town house opposite mine. I've never seen or met him. How do I know he's called Michael? Because once, maybe two, sometimes 3 times a day, there will be one of a variety of people standing outside his front door, should "MICHAEL!" up at his open window. This could be 8am or 3am, and has in the past led to a barrage of "FUCK OFF!"s from my neighbours, but nothing seems to deter them.

Question: should I make a note that says "MICHAEL - BUY A FUCKING DOORBELL" and stick it on his front door?