Daily rant number n

Another thing that's bugging me recently (as if there weren't enough already: there's a persistent cell-phone-like ringing noise in the courtyard outside the building where I work. Every fifteen to thirty seconds, there's this upward trill that sounds very much like a cell phone going off, except I can't pinpoint its location or determine why the ringing is so insistent. It's driving me nuts, though, every single time I cut across the courtyard to go to the libraries.

Aargh.