This is the one on my computer desk, and it's obnoxious as hell when it rings:

Back in my previous, pre-retirement life, it served a different purpose. When it rang, it meant that those of us lucky to be on alert duty had best boogie to the 8-engined jet - posthaste!
Now when it rings, it usually means I'm supposed to pick up something at the store for my wife, etc. That Western Electric ringer, btw, drives the dogs absolutely bonkers!