......this was ridiculous!
One of my coworkers got a new iPhone. He's been downloading lots of free apps, having fun with it. He was demonstrating it to some of my coworkers, several cubes away from mine. All I hear is this high-pitched electronic noise. I thought my monitor was going. It stopped and started up again. Apparently, the app he was demonstrating was some annoying noise app. He was demonstrating the dog whistle.
What makes it even worse is that I started walking down towards the cube they were in, and asked if they were making some high pitched noise. One of them told me that it was a dog whistle. I just looked at her, and she realized what she said.
Still, they couldn't believe that I could hear it.