Singing / Whistling In The Office
What's much more annoying is people who discordantly hum just under their breath.
These are the ball-lickers who do not deserve to live.

I count alongside them people who can't help but clear their throats, loudly, every 2 minutes or so.

They'd go first.
(caescarna Hell's Roomba, Mon 1 Jun 2009, 14:33, archived)