Workers feeling sick often force themselves to work reducing the efficiency of the workplace, a practice known as presenteeism. The New York Times has 5 good reasons to stay home when you come down with a cold.
Since people are most contagious in the first two or three days of a cold, you will help your whole organization by not getting your colleagues sick.
The article also makes to good point that rest will help to get better faster and is a better alternative than going to work and hardly working for a week. If you’ve got the option, consider a few hours to efficient telecommuting. Who knows - you may even make a colleague happy that you’re out, it may just cancel that meeting they’ve been dreading!
[photo by: delinion]
Sounds like something you would do though, aop. 
Next time you come up to a public toilet with some leftover pee or poo save your self some effort and leave it there. Seeing someone else’s excrement may not be the most pleasant experience but you’ll only be peeing on it anyway.