Via Bruce Schneier:
H1. Humans
H1.1 Description:
The species Homo sapiens supports a wide range of intellectual capabilities such as speech, emotion, rational thinking etc. Many of these components are enabled by default - though to differing degrees of success. These components are implemented by the cerebral cortex, and are under the control of the identity engine which runs as me.exe. Vulnerabilities in these components are the most common avenues for exploitation.
Original source is a dshield mailing list but it is quoted in full in this blog entry by Rick Wanner