One of the kids at my job managed to tune his whine into a fucking siren. Seriously. He'd ramp up the volume and pitch, ramp back down, and repeat, just like an ambulance.

I can see why he did - it's very good at getting someone's attention. Our practice is to ignore it and prompt functional communication instead, and thankfully it's working as I haven't heard the "ambulance whine" in a while. But wow, it was a truly awful sound. I'll take straight screaming over that noise any day.