A childhood belief about general

When I was younger, my sister convinced me that we could talk through different toilets around the house to each other. It became a sort of ritual - we would each go to different toilets in the house, bend over, and attempt to communicate secret messages to each other through the them, sort of like the idea of talking through walls. She also tortured me with the idea that she could hear me pee in one toilet through another toilet, so I was paranoid and bladder shy for quite a while.