This isn't anything I was told but when I was 7 we moved to a really old house with old plumbing. I soon became scared silly of the toilet when it was flushed (I know, really mature for a 7 year old), so much that I developed IBS and a fear of all toilets. Took me until I was about 10 to get over it and we had long since moved to a new house with a new toilet. TMI? Well just an example of a silly childhood fear.