How to drive your minions madder than they already are

Our building has a intercom system which I think has been purposefully used once, way back when we first moved in in October. I think it was used to say someone had left their lights on or something. Since then, we only occasionally get a reminder that the system even exists when the sound announcing that there will be an announcement is randomly aired, but nothing follows it. The sound is very annoying, an old-fashioned NBC-like xylophone tune of "boing, boing, boing, boing, boingboingboingboing", the notes going up in pitch. Actually, you do get a warning of the annoying sound before it comes on because you can hear a speaker buzz start first.

This morning, for the past 30-45 mins, the bloody noise has been coming on over the intercom system every few mins or so. It is really pissing me off. It'll be quiet, and then suddenly the noise will play a few times in a row, sometimes getting interrupted, sometimes not. And it's fairly loud and I don't have an office door I can shut to try to drown it out.

We usually never get any explanation for being bombarded with this noise at random, for no reason. I usually assume a receptionist hit the button by accident. The times when it sounds over and over again, like now, I think they just have nothing better to do on a Friday than drive the entire building nuts. This time though we finally got an email saying that they are having technical problems with the system and are sorry for the inconvenience. The least they could do is hand out earplugs.