When I was a physical toddler, my mother apparently thought she could force me to be night trained if she treated me badly enough.
Any morning I woke up wet, I was spanked and put into a totally COLD shower. (It didn't work very well.)
I found that later on, I would not take showers until much later, maybe 15 or 16 years. I kept to baths. It may have been because of the fear instilled by the bad experiences. Even as an adult, I found that when first getting into a hot shower, it felt cold to me.
Anyone have a fear of something of this nature?