back in college I was living an a room that I rent from a nice old lady trying to make some extra money. Due to it being a small space and other factors like noise and sun light, my bed end up next to the door to the bathroom. I got pink eye at least three times that year, before I was able to get a better place.
Ever since myth busters my toothbrush almost always have a cap on it and I always close the lid before flushing the toilet.