Reminds me of the time I bought these little speakers with wee magnets in them, they had a few sounds you could cycle through and one of them was a cat meowing. They'd play tye sound every 5 minutes or so and ilat the time I lived with 6 others in my flat. I kept shifting the speaker to different places every few days and would take it away for a couple days at a time. I had all my flatmates looking around wondering where this fucking cat was to the point one of them thought it was in the wall or something. I even walked around the house and was helping them search for the cat. I eventually caved and let them in on the joke and got some good reactions from them.