A childhood belief about bathrooms

I'm 17 now and, thankfully, have slightly more sense now. When I was 3, I would stay at my grandma's house quite often. She hated bugs and would flush them down the toilet when she found them. One day, I was misbehaving quite badly and Grandma told me she was going to flush me down the toilet like she had done to a cricket earlier that day. This traumatized me and a few weeks later, my parents were trying to wash my hair in the kitchen sink, but couldn't figure out why I would scream and slap at them when I saw the drain. After my grandmother heard about this, she confessed what she had said to me on that terrifying day at her house.