(Image: Tom Casey and Eitan Sheena)
The typical bottle of hand sanitizer will tell you that it kills 99.99% of the germs on your hands. Just slather it on.
Science has advanced to the point in which it can kill 100% of germs. But to deter other attacks, it's necessary to send back at least one germ as a warning to the others.
-via Tastefully Offensive
http://xkcd.com/1161/
P.S.: Happy end-of-year-consumption-spree....