We had a little ditzy girl working for us years ago. One of the guys brought in a small transmitter and set it to the radio station we had on. Every few hours he'd whisper in to it, "Stephanie-e-e-e-e". She'd look all around and since we all knew about it, we didn't flinch. She'd ask if we heard that. Of course we hadn't heard anything. We only did it a few days before we had to bust out laughing. She was ready to check herself in to the Ha Ha Hotel