Quoted from chad:And make sure your toliet lid is down when flushing. Imagine all the particulants fliating out to your toothbrush.
I worked at Radio Shack 20 years ago and my co-workers thought it was a good idea to put the coffee maker on top of the back of the toilet - no joke! I guess it was because that's where the running water was. I wasn't a coffee drinker at the time so it took me at least a month to say "you better hope no one misses when they go to the bathroom." The "oh shit" reaction was priceless.