He violently threw his phone when it wouldn't stop ringing and he was in a mental state that didn't want to experience said ringing.

In other words: understand that it will ding for all new users. all of them. Get a lot of dings. Get them at 3 in the morning. Get them during a date. All dings.

To relate: if you're the kind of person that turns off your IM sounds because they annoy you, this is not for you. I am one of those people: even a window blinking too frequently bothers me.