Time Warp: Toilet Flush
With the help of a little dry ice, you can see a toilet plume — the dispersion of water and waste that becomes airborne every time you flush.
http://dsc.discovery.com/videos/time-warp-toilet-flush.html
Beware of the storage location of your toothbrushes and razors.
For the past couple decades I have kept my toothbrush in a glass of hydrogen peroxide.