YART, not yurt, is Yet Another Rehashed Topic, acc'g. to its
inventor.

And, Bean, this isn't one. My guess would be that alarms go off for the same reason something or someone sounds off, to make itself/himself heard, though why that is, I
don't know. Possibly because it is a departure from the normal pattern, or path, of behavior--off the regular path, as it were?