Santa Claus
When I lock the toilett cabine it won’t open anymore and I have to stay there forever. Haven’t done it until middleschool and yes that leads to many embarassing moments.
Shots/vaccinations. I was convinced that my veins were already full of blood, and injecting any more liquid into them would cause them to explode.
The bookshelf
Flushing the toilet at night. It seemed so loud and would literally freak me out