That you could catch pneumonia from breathing in steam from the shower as I heard that a symptom is water in the lungs. A friend's dad died of pneumonia and I had to shower with my head stuck out of the curtain.
I was in a hospital for 12 days that had legionnaires disease causing bacteria all through the water pipes so you had to only use cold water. The steam from hot water, inhaled, is how you get it. So, you know, you were onto something there.